Joseph Duggan to David Duncan - 1911 Census household returns
- Joseph Duggan to Michael Duggan
- Michael Duggan to Sabina Annie Duggan
- Samuel Duggan to Timothy Duggan
- Tom Duggan to John Duggeleby
- Thomas Duggem to Charles Duggins
- Charles Duggins to Arthur Duggleby
- Charles Henry Duggleby to George Dughton
- Thomas Dughton to George Henry Dugmore
- George J Dugmore to William Dugmore
- William Henry Dugmore to John Duguid
- John Duguid to William Duigley
- John Thomas Duigman to Alfred Duke
- Alfred Duke to Arthur Duke
- Arthur Duke to Charles Miller Duke
- Charles Richard Duke to Elizabeth Eliza Duke
- Elizabeth Esther Duke to Fred Hitchcock Duke
- Frederick Duke to George Duke
- George Duke to Henry Duke
- Henry Duke to James Duke
- James Duke to John Duke
- John Duke to Kate Duke
- Kate Duke to Reginald E Duke
- Reginald O Duke to Sarah Duke
- Sarah Duke to Thomas James Duke
- Thomas John Duke to William Duke
- William Duke to Victor Duke Of Devonshire
- George E Duke Senr to Charles Dukes
- Charles Dukes to Fredrick Dukes
- Fredrick Dukes to Jane Dukes
- Jane Eliza Dukes to Rosa Dukes
- Rose Dukes to William Wilson Dukes
- Willion Dukes to Abram Dulberger
- James Dulbock to Joseph Attworth Duley
- Joseph Samuel Duley to John William Dulien
- John William Joseph Dulien to Samuel Dull
- Frederick I Dulladay to Henry Duller
- James Duller to Joseph Dulloge
- E Dullroy to John Dulson
- John Edwin Dulson to Ada Dulton
- Albert Dulton to Alfred William Duly
- Archibald Duly to William Henry Duly
- William Henry Duly to Frederick Ernest Dumayne
- Frederick John Dumayne to James Dumbell
- James Burns Dumbell to William Dumbill
- William H Dumbill to William Ernest Dumble
- William Henry Dumble to Herbert Dumbleton
- Herbert Edward Dumbleton to William Dumbleton
- William Dumbleton to John Dumbrell
- John Dumbrell to William James Dumbrill
- William Thomas Dumbrill to Joshua Dumesday
- Lydia Dumezy to Alfred Stephen Dummer
- Arthur Dummer to Margaret Dummer
- Mary Ann Dummer to James Dummett
- James Dummett to Charles Dumon
- Thomas Dumon to Ellen A Dumper
- Ernest Dumper to James Dumphy
- James Dumphy to Edwin Henry Dumpress
- Joseph Dumps to John Dumville
- John Middleton Dumville to Charles Dunan
- Claude Dunand to John Emmanuel Dunbach
- Arthur Dunball to Edmund Dunbar
- Edmund Dunbar to James Dunbar
- James Dunbar to Leonard Strachan Dunbar
- Lewis James Dunbar to Thomas Dunbar
- Thomas Dunbar to Elizabeth Dunbavand
- Fred Dunbavand to Mary Dunbobin
- Annie Dunbor to John Duncalf
- John Duncalf to Mary Duncalfe
- Matilda Duncalfe to Alexander G Duncan
- Alexander George Duncan to Ann Duncan
- Ann Duncan to Charles Duncan
- Charles Duncan to David Duncan