| Name | Birth date | Relationship with Floyd Williams |
|---|
| De Rennes, Pope | 872 | 34th great-grandmother |
| De Tirel, Fulke | WFT Est. 889-966 | 29th great-grandfather |
| De Tirel, Walter I | WFT Est. 925-996 | 28th great-grandfather |
| De Tirel, Walter II | WFT Est. 963-1026 | 27th great-grandfather |
| De Tirel, Walter III | WFT Est. 1038-1102 | 26th great-grandfather |
| Dein | WFT Est. Bef. 100 | 90th great-grandfather |
| | | 94th great-grandfather |
| Desiderata, Of Lombard | WFT Est. 734-757 | 38th great-grandmother |
| Desiderius, King Of Italy | WFT Est. 691-730 | 39th great-grandfather |
| Despencer, Hugh | March 3, 1287/88 | 21st great-grandfather |
| | | Husband of the half 9th cousin 23 times removed |
| | | Husband of the 12th cousin 23 times removed |
| | | Husband of the 13th cousin 24 times removed |
| | | Husband of the 14th cousin 22 times removed |
| | | Husband of the 15th cousin 22 times removed |
| | | Husband of the 14th cousin 24 times removed |
| | | Husband of the 15th cousin 23 times removed |
| Despencer, Isabelle | WFT Est. 1284-1310 | 20th great-grandmother |
| | | Half 10th cousin 22 times removed |
| | | 13th cousin 22 times removed |
| | | 14th cousin 23 times removed |
| | | 15th cousin 21 times removed |
| | | 16th cousin 21 times removed |
| | | 15th cousin 23 times removed |
| | | 16th cousin 22 times removed |
| Diacles | WFT Est. Bef. 100 | 79th great-grandfather |
| Doda | WFT Est. 551-590 | 43rd great-grandmother |
| Doda | Abt. 980 | 31st great-grandmother |
| Domaldi Visbursson | Abt. 340 | 57th great-grandfather |
| Domar Domaldasson | Abt. 361 | 56th great-grandfather |
| Donald II, MacAlpin | Abt. 862 | 35th great-grandfather |
| Donald, I | 600 | 45th great-grandfather |
| Dongard | 497 | 49th great-grandfather |
| | | 22nd cousin 55 times removed |
| Dongard, II | Abt. 620 | 44th great-grandfather |
| Donlin, Michele | Private | Daughter-in-law |
| Dornadel | WFT Est. Bef. 100 | 68th great-grandfather |
| | | 3rd cousin 74 times removed |
| Dorothen, Sophia | 1666 | Wife of the 13th cousin 11 times removed |
| | | Wife of the half 21st cousin 11 times removed |
| Downey, Frank | March 16, 1886 | Husband of the aunt |
| Downey, Gerald | Private | 1st cousin |
| Downey, Nihla Ann | | 1st cousin |
| Driva Snaersson | Abt. 302 | 59th great-grandmother |
| Drott Danpsson | Abt. 365 | 56th great-grandmother |
| Drusus | WFT Est. Bef. 100 | 61st great-grandfather |
| Duke | 870 | 34th great-grandfather |
| Duke, Long Sword | 893 | 33rd great-grandfather |
| | | 33rd great-granduncle |
| Duncan, I | 1001 | 30th great-grandfather |