| Name | Birth date | Relationship with Floyd Williams |
|---|
| | | 83rd great-grandmother |
| Cynvelin King Of Brittain | WFT Est. Bef. 100 | 60th great-grandfather |
| Dag Dyggvasson | Abt. 403 | 54th great-grandfather |
| Dagobert | WFT Est. 201-250 | 52nd great-grandfather |
| Dagobert | WFT Est. 261-306 | 50th great-grandfather |
| Dagreid Dagsson | Abt. 449 | 52nd great-grandmother |
| Daley, Margarite | Abt. 1801 | 3rd great-grandmother of the wife |
| Dan | WFT Est. Bef. 100 | 90th great-grandfather |
| | | 94th great-grandfather |
| Dan Olafsson | Abt. 412 | 52nd great-grandfather |
| d'Arcy, Eleanor | WFT Est. 1419-1459 | 16th great-grandmother |
| d'Aumale, Ada | WFT Est. 1079-1137 | 25th great-grandmother |
| De Bretagne, Sprote | Abt. 911 | 33rd great-grandmother |
| | | Wife of the 33rd great-granduncle |
| De Champagne, Elienne, Compte d'Aumale | WFT Est. 1043-1109 | 26th great-grandfather |
| De Clare, Eleanor | WFT Est. 1284-1295 | 21st great-grandmother |
| | | Half 9th cousin 23 times removed |
| | | 12th cousin 23 times removed |
| | | 13th cousin 24 times removed |
| | | 14th cousin 22 times removed |
| | | 15th cousin 22 times removed |
| | | 14th cousin 24 times removed |
| | | 15th cousin 23 times removed |
| De Clare, Gilbert, Earl Of Gloucester | 1243 | 22nd great-grandfather |
| | | Husband of the half 8th cousin 24 times removed |
| | | Husband of the 11th cousin 24 times removed |
| | | Husband of the 12th cousin 25 times removed |
| | | Husband of the 13th cousin 23 times removed |
| | | Husband of the 14th cousin 23 times removed |
| | | Husband of the 13th cousin 25 times removed |
| | | Husband of the 14th cousin 24 times removed |
| De Coggeshall, Margaret | WFT Est. 1393-1416 | 17th great-grandmother |
| De Coggeshall, William | WFT Est. 1351-1390 | 18th great-grandfather |
| De Courteney, Peter | WFT Est. 1091-1142 | 27th great-grandfather |
| De Crepon, Gonnor | Abt. 936 | 32nd great-grandmother |
| | | 4th cousin 33 times removed |
| | | 4th cousin 34 times removed |
| | | Wife of the 1st cousin 34 times removed |
| De Falaise, Harlette | Abt. 1003 | 30th great-grandmother |
| | | Wife of the 3rd cousin 32 times removed |
| | | Wife of the 6th cousin 31 times removed |
| | | Wife of the 6th cousin 32 times removed |
| De Guise, Mary | Abt. 1515 | Wife of the 8th cousin 16 times removed |
| | | Wife of the half 16th cousin 16 times removed |
| | | Wife of the 19th cousin 16 times removed |
| | | Wife of the 20th cousin 17 times removed |
| | | Wife of the 21st cousin 15 times removed |
| | | Wife of the 22nd cousin 15 times removed |
| | | Wife of the 21st cousin 17 times removed |
| | | Wife of the 22nd cousin 16 times removed |