Roger de Duffeld · Glasgow surname archive

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Current conclusion

Roger de Duffeld is cited in modern surname scholarship as an early bearer of the Duffield locative in a Yorkshire Pipe Roll of 1190. The often-repeated description of this entry as a “1190 Poll Tax record” is wrong: the cited source is a Pipe Roll, not a medieval poll-tax return.^[1]

The citation establishes an early name occurrence. It does not by itself identify Roger's occupation, landholding, parents, descendants, residence at Duffield Castle or membership in a Norman administrative network. The underlying Pipe Roll entry still needs direct inspection for its full context.

Name evidence

Duffeld is a locative form associated with places named Duffield, including Duffield in Derbyshire and North and South Duffield in Yorkshire. A locative can identify origin or association with a place; it does not prove descent from the lords, officials or inhabitants of a particular castle or estate.

Later medieval bearers of the name are separate evidence and should not be treated as Roger's descendants without connecting records.

Glasgow and Y-DNA hypothesis

Roger may have been a Norman administrator or landholder, and a possible descendant migration to Scotland leading to the de Glasgu bearers remains an interesting research hypothesis. No inspected document yet connects Roger to a Glasgow bearer or identifies him with Y-DNA branch R-FT32941.

Modern Duffield and Glasgow testers sharing an upstream Y-DNA branch may indicate a much older paternal common ancestor. It cannot identify Roger as that ancestor, make a named medieval Glasgow bearer his descendant, or prove a surname change without a documented male-line bridge or relevant ancient DNA.

The Roger-to-Glasgow theory therefore remains a research hypothesis, not a genealogy.

Research priorities

Inspect the 1190 Yorkshire Pipe Roll entry cited by the Oxford dictionary and record its exact Latin, membrane and fiscal context.
Determine whether the entry identifies a place of origin or residence.
Keep any genetic comparison at the level supported by tested modern lines and the reported confidence interval.

Sources

Source references

Patrick Hanks, Richard Coates and Peter McClure, eds., The Oxford Dictionary of Family Names in Britain and Ireland (Oxford University Press, 2016), entry “Duffield”, citing “Roger de Duffeld', 1190 in Pipe Rolls (Yorks)”.

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[[Category:Glasgow Name Study]]
<small>'''Glasgow Name Study:''' [[Space:Glasgow Name Study|project home]] · [[Space:Glasgow Research|research directory]] · [https://glasgow.phenotype.dev/ digital workbench]</small>


== Current conclusion ==

'''Roger de Duffeld''' is cited in modern surname scholarship as an early bearer of the Duffield locative in a Yorkshire Pipe Roll of 1190. The often-repeated description of this entry as a “1190 Poll Tax record” is wrong: the cited source is a Pipe Roll, not a medieval poll-tax return.<ref name="OxfordDuffield">Patrick Hanks, Richard Coates and Peter McClure, eds., ''The Oxford Dictionary of Family Names in Britain and Ireland'' (Oxford University Press, 2016), entry “Duffield”, citing “Roger de Duffeld', 1190 in Pipe Rolls (Yorks)”.</ref>

The citation establishes an early name occurrence. It does not by itself identify Roger's occupation, landholding, parents, descendants, residence at Duffield Castle or membership in a Norman administrative network. The underlying Pipe Roll entry still needs direct inspection for its full context.

== Name evidence ==

''Duffeld'' is a locative form associated with places named Duffield, including Duffield in Derbyshire and North and South Duffield in Yorkshire. A locative can identify origin or association with a place; it does not prove descent from the lords, officials or inhabitants of a particular castle or estate.

Later medieval bearers of the name are separate evidence and should not be treated as Roger's descendants without connecting records.

== Glasgow and Y-DNA hypothesis ==

Roger may have been a Norman administrator or landholder, and a possible descendant migration to Scotland leading to the ''de Glasgu'' bearers remains an interesting research hypothesis. No inspected document yet connects Roger to a Glasgow bearer or identifies him with Y-DNA branch R-FT32941.

Modern Duffield and Glasgow testers sharing an upstream Y-DNA branch may indicate a much older paternal common ancestor. It cannot identify Roger as that ancestor, make a named medieval Glasgow bearer his descendant, or prove a surname change without a documented male-line bridge or relevant ancient DNA.

The Roger-to-Glasgow theory therefore remains a research hypothesis, not a genealogy.

== Research priorities ==

# Inspect the 1190 Yorkshire Pipe Roll entry cited by the Oxford dictionary and record its exact Latin, membrane and fiscal context.
# Determine whether the entry identifies a place of origin or residence.
# Keep any genetic comparison at the level supported by tested modern lines and the reported confidence interval.

== Related research ==

* [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 Consolidated early-bearers register]
* [[Space:Glasgow Ancient YDNA|Glasgow Ancient Y-DNA research]]

== Sources ==

<references />