Glasgow Ancient YDNA · Glasgow surname archive

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Project status: current deep-Y-DNA guide; architecture reviewed 29 August 2026. Claims remain subject to the evidence statement on this page.

Glasgow Ancient Y-DNA

This page describes the deep paternal ancestry of the principal tested Glasgow surname cluster. It deliberately stops where genetic topology stops. Y-DNA can connect tested paternal lines and estimate the age of their shared branches; it cannot identify a medieval surname bearer without a supported documentary male-line pedigree or relevant ancient DNA.

Evidence warning
Earlier versions assigned Roger de Duffeld, John of Huntingdon, John de Glasgu, Adam de Glasgu, John Glasgw of Stirling and John de Glasgow alias Smith to specific modern SNP branches. Those assignments are withdrawn. No inspected record or ancient-DNA result proves them. “Norman knight”, “Duffield Castle retainer”, “Vipont migration”, “clerical migration” and “king's armourer” are historical hypotheses, not genetic findings.

Evidence warning

Earlier versions assigned Roger de Duffeld, John of Huntingdon, John de Glasgu, Adam de Glasgu, John Glasgw of Stirling and John de Glasgow alias Smith to specific modern SNP branches. Those assignments are withdrawn. No inspected record or ancient-DNA result proves them. “Norman knight”, “Duffield Castle retainer”, “Vipont migration”, “clerical migration” and “king's armourer” are historical hypotheses, not genetic findings.

Current project topology

The principal working paternal path is:

R-M269 → R-U106 → R-Z18 → R-Z17 → R-S20045 → R-S14827 → R-FT4811 → R-FT32941 → R-FT25406

The topology and date estimates should be checked against the FamilyTreeDNA Glasgow Project public SNP results and each branch's current Discover page because both may change as new testers and variants are added.^[1]

Branch	Safe interpretation	What is not established
R-Z18 / R-Z17	deep northern European paternal context predating surnames by millennia	a Glasgow surname origin, nationality or named migration
R-S20045 / R-S14827	rare downstream branches whose modern distribution may help guide comparative testing	a specific Iron Age tribe, culture or route followed by the project ancestor
R-FT4811	a shared paternal ancestor of downstream tested lines, genetically estimated around the medieval period	arrival in 1066, Norman social status or service to Ferrers or Vipont
R-FT32941	a shared branch relevant to tested Glasgow, Duffield or comparison lines	residence at Duffield Castle or descent from Roger de Duffeld
R-FTA30932	a comparison branch which may illuminate the deeper split from the principal Glasgow cluster	that a surname, estate or medieval Churnside family identifies the SNP founder
R-FT25406	the principal tested Glasgow surname cluster; its age estimate overlaps the broad surname-forming period	that its founder was a particular fifteenth-century Glasgow bearer
R-FT20271 and later branches	downstream structure among tested modern paternal lines	one universal Scottish, Ulster or American pedigree without documentary descent for every tester

Other Glasgow or similar-surname testers may belong to different paternal lineages, including branches under R-P312. That is expected in a surname project and may reflect independent surname formation, surname adoption, an undocumented paternal event or a spelling convergence. It must not be forced into the R-FT25406 tree.

Genetic dates

A branch date is an estimate calculated from observed variants and the present tester sample. It should be reported with its uncertainty, not as the birth year of a named ancestor. For R-FT25406, the project's recorded platform estimate was a most likely common ancestor around 1429 CE, displayed approximately as 1450 CE, with a much wider 95% interval of 1195–1607 CE.^[2]

That interval overlaps multiple documentary bearers and generations. It cannot choose between them.

Geographic and ancient-DNA context

Parent branches such as R-U106, R-Z18 and R-Z17 can be compared with published ancient genomes and the distribution of tested modern men. These comparisons can supply population-level context. They do not create a personal genealogy from Bronze Age, Iron Age, Viking or Norman individuals to the Glasgow surname.

Three controls apply:

modern testing is geographically and socially uneven;
a parent haplogroup may have had many contemporary descendants in different places;
an ancient sample sharing an upstream branch is not necessarily a direct ancestor.

Images and migration maps on this page should therefore be read as broad visual context only. The project Y-DNA timeline is also a finding aid, not a source for a named historical relationship.

Boundary with the medieval record

The documentary evidence is maintained separately:

the pre-1500 bearer register establishes who is actually recorded and keeps distinct people distinct;
Early Scottish branches establishes the first secure multi-generation burgh pedigree;
The Medieval Origins tests the Duffield, Norman and migration hypotheses against both the genetic and documentary limits.

The project's current conclusion is that no continuous documentary male-line pedigree joins a tested man to a named pre-1500 de Glasgu bearer. Until one does, no medieval bearer should be described as carrying R-FT4811, R-FT32941, R-FT25406 or a downstream SNP.

Research programme

Document the direct paternal ancestry of each tester to the earliest reliable male ancestor.
Recruit independent descendants of distinct Scottish, Irish and diaspora root families.
Compare representatives from plausible collateral surnames without presuming a historical explanation.
Record platform topology and estimate changes with dates.
Keep candidate medieval identifications on hypothesis pages until a testable documentary bridge is found.
Respect tester privacy and publish conclusions at the branch level unless explicit consent supports more detail.

Resources

Sources

Source references

FamilyTreeDNA, Glasgow Surname Project public Y-DNA SNP results, accessed 31 July 2026.
FamilyTreeDNA Discover estimate for R-FT25406, recorded 31 July 2026: most likely 1429 CE, displayed as 1450 CE, 95% interval 1195–1607 CE. The live estimate may change as testing develops.

WikiTree and this edition

Not checked against current WikiTree text

Saved source: 2026-08-29. Local corrections are preserved; differences are reviewed before either edition is replaced.

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Local replacement text

[[Category:Glasgow Name Study]]
[[Category:DNA Projects]]
[[Category:Y-DNA Haplogroup R-U106]]
{{One Name Study|name=Glasgow}}

<small>'''Glasgow Name Study:''' [[Space:Glasgow Name Study|project home]] · [[Space:Glasgow Research|research directory]] · [[Space:Glasgow DNA|surname-DNA guide]] · [https://glasgow.phenotype.dev/ydna interactive explorer]</small>

<small>'''Project status:''' current deep-Y-DNA guide; architecture reviewed 29 August 2026. Claims remain subject to the evidence statement on this page.</small>


= Glasgow Ancient Y-DNA =

This page describes the deep paternal ancestry of the principal tested Glasgow surname cluster. It deliberately stops where genetic topology stops. Y-DNA can connect tested paternal lines and estimate the age of their shared branches; it cannot identify a medieval surname bearer without a supported documentary male-line pedigree or relevant ancient DNA.

{| class="wikitable" style="background:#fff8e8; width:100%;"
! Evidence warning
|-
| Earlier versions assigned Roger de Duffeld, John of Huntingdon, John de Glasgu, Adam de Glasgu, John Glasgw of Stirling and John de Glasgow alias Smith to specific modern SNP branches. Those assignments are '''withdrawn'''. No inspected record or ancient-DNA result proves them. “Norman knight”, “Duffield Castle retainer”, “Vipont migration”, “clerical migration” and “king's armourer” are historical hypotheses, not genetic findings.
|}

== Current project topology ==

The principal working paternal path is:

:'''R-M269 → R-U106 → R-Z18 → R-Z17 → [[Space:R-S20045|R-S20045]] → [[Space:R-S14827|R-S14827]] → [[Space:R-FT4811|R-FT4811]] → [[Space:R-FT32941|R-FT32941]] → [[Space:R-FT25406|R-FT25406]]'''

The topology and date estimates should be checked against the [https://www.familytreedna.com/public/Glasgow?iframe=ysnp FamilyTreeDNA Glasgow Project public SNP results] and each branch's current Discover page because both may change as new testers and variants are added.<ref name="FTDNAProject">[https://www.familytreedna.com/public/Glasgow?iframe=ysnp FamilyTreeDNA, Glasgow Surname Project public Y-DNA SNP results], accessed 31 July 2026.</ref>

{| class="wikitable"
! Branch
! Safe interpretation
! What is not established
|-
| '''R-Z18 / R-Z17'''
| deep northern European paternal context predating surnames by millennia
| a Glasgow surname origin, nationality or named migration
|-
| '''[[Space:R-S20045|R-S20045]] / [[Space:R-S14827|R-S14827]]'''
| rare downstream branches whose modern distribution may help guide comparative testing
| a specific Iron Age tribe, culture or route followed by the project ancestor
|-
| '''[[Space:R-FT4811|R-FT4811]]'''
| a shared paternal ancestor of downstream tested lines, genetically estimated around the medieval period
| arrival in 1066, Norman social status or service to Ferrers or Vipont
|-
| '''[[Space:R-FT32941|R-FT32941]]'''
| a shared branch relevant to tested Glasgow, Duffield or comparison lines
| residence at Duffield Castle or descent from Roger de Duffeld
|-
| '''[[Space:R-FTA30932|R-FTA30932]]'''
| a comparison branch which may illuminate the deeper split from the principal Glasgow cluster
| that a surname, estate or medieval Churnside family identifies the SNP founder
|-
| '''[[Space:R-FT25406|R-FT25406]]'''
| the principal tested Glasgow surname cluster; its age estimate overlaps the broad surname-forming period
| that its founder was a particular fifteenth-century Glasgow bearer
|-
| '''[[Space:R-FT20271|R-FT20271]]''' and later branches
| downstream structure among tested modern paternal lines
| one universal Scottish, Ulster or American pedigree without documentary descent for every tester
|}

Other Glasgow or similar-surname testers may belong to different paternal lineages, including branches under [[Space:R-P312|R-P312]]. That is expected in a surname project and may reflect independent surname formation, surname adoption, an undocumented paternal event or a spelling convergence. It must not be forced into the R-FT25406 tree.

== Genetic dates ==

A branch date is an estimate calculated from observed variants and the present tester sample. It should be reported with its uncertainty, not as the birth year of a named ancestor. For R-FT25406, the project's recorded platform estimate was a most likely common ancestor around 1429 CE, displayed approximately as 1450 CE, with a much wider 95% interval of 1195–1607 CE.<ref name="FT25406Estimate">FamilyTreeDNA Discover estimate for R-FT25406, recorded 31 July 2026: most likely 1429 CE, displayed as 1450 CE, 95% interval 1195–1607 CE. The live estimate may change as testing develops.</ref>

That interval overlaps multiple documentary bearers and generations. It cannot choose between them.

== Geographic and ancient-DNA context ==

Parent branches such as R-U106, R-Z18 and R-Z17 can be compared with published ancient genomes and the distribution of tested modern men. These comparisons can supply population-level context. They do not create a personal genealogy from Bronze Age, Iron Age, Viking or Norman individuals to the Glasgow surname.

Three controls apply:

# modern testing is geographically and socially uneven;
# a parent haplogroup may have had many contemporary descendants in different places;
# an ancient sample sharing an upstream branch is not necessarily a direct ancestor.

Images and migration maps on this page should therefore be read as broad visual context only. The [https://glasgow.phenotype.dev/timeline project Y-DNA timeline] is also a finding aid, not a source for a named historical relationship.

== Boundary with the medieval record ==

The documentary evidence is maintained separately:

* the [https://www.wikitree.com/wiki/Space:Bearers_of_the_%27%27de_Glasgu%27%27_Name_and_the_Emergence_of_the_Glasgow_Surname%2C_c.1175%E2%80%931500 pre-1500 bearer register] establishes who is actually recorded and keeps distinct people distinct;
* [[Space:Glasgow Branches in 15th and 16th Century Scotland|Early Scottish branches]] establishes the first secure multi-generation burgh pedigree;
* [[Space:The Medieval Origins: From Normans to Glasgow|The Medieval Origins]] tests the Duffield, Norman and migration hypotheses against both the genetic and documentary limits.

The project's current conclusion is that no continuous documentary male-line pedigree joins a tested man to a named pre-1500 ''de Glasgu'' bearer. Until one does, no medieval bearer should be described as carrying R-FT4811, R-FT32941, R-FT25406 or a downstream SNP.

== Research programme ==

* Document the direct paternal ancestry of each tester to the earliest reliable male ancestor.
* Recruit independent descendants of distinct Scottish, Irish and diaspora root families.
* Compare representatives from plausible collateral surnames without presuming a historical explanation.
* Record platform topology and estimate changes with dates.
* Keep candidate medieval identifications on hypothesis pages until a testable documentary bridge is found.
* Respect tester privacy and publish conclusions at the branch level unless explicit consent supports more detail.

== Resources ==

* [https://www.familytreedna.com/groups/glasgow/ FamilyTreeDNA Glasgow Surname Group]
* [https://www.familytreedna.com/public/Glasgow?iframe=ysnp public SNP results]
* [[Space:Glasgow DNA|Glasgow surname-DNA guide]]
* [https://glasgow.phenotype.dev/ydna Glasgow Y-DNA Explorer]
* [https://glasgow.phenotype.dev/timeline Glasgow Y-DNA Timeline]
* [https://groups.io/g/glasgowdnaproject project discussion group]

== Sources ==

<references />