| Name | Birth date | Relationship with Floyd Williams |
|---|
| Charles II, King Of Franks | WFT Est. 787-812 | 36th great-grandfather |
| Charles, Of Franconia | WFT Est. 763-791 | 37th great-grandfather |
| Charles, Prince Of Wales | Private | 23rd cousin once removed |
| Charlotte | 1744 | Wife of the 16th cousin 8 times removed |
| Childebrand, I | WFT Est. 582-677 | 39th great-grandfather |
| Childebrand, II | WFT Est. 690-769 | 36th great-grandfather |
| Christiansen, Kurt Stephan | Private | Son-in-law |
| Christiansen, Megan Sue | Private | Granddaughter |
| Christiansen, Van Marshall | Private | Grandson |
| Claudius | WFT Est. Bef. 100 | 60th great-grandfather |
| Clodimir, II | WFT Est. Bef. 100 | 72nd great-grandfather |
| Clodimir, III | WFT Est. Bef. 100 | 65th great-grandfather |
| Clodimir, IV | WFT Est. Bef. 100 | 59th great-grandfather |
| Clodius | WFT Est. Bef. 100 | 74th great-grandfather |
| Clodius | WFT Est. 272-332 | 49th great-grandfather |
| Clodius | WFT Est. 338-418 | 46th great-grandfather |
| Clodius, II | WFT Est. Bef. 100 | 67th great-grandfather |
| Clodius, III | WFT Est. 180-206 | 54th great-grandfather |
| Coel | WFT Est. Bef. 132 | 57th great-grandfather |
| Coel | WFT Est. 197-226 | 54th great-grandfather |
| Cole, King | WFT Est. Bef. 132 | 57th great-grandfather |
| Collard, Dorothy | WFT Est. 1608-1634 | 8th great-grandmother |
| | | Wife of the half 22nd cousin 10 times removed |
| Conair The Great | WFT Est. Bef. 100 | 65th great-grandfather |
| | | 6th cousin 71 times removed |
| Conaire, II | WFT Est. Bef. 157 | 61st great-grandfather |
| | | 10th cousin 67 times removed |
| Constantine I, King Of The Picta | Abt. 836 | 36th great-grandfather |
| Constantine The Great | 265 | 52nd great-grandfather |
| Constantine, I | 535 | 48th great-grandfather |
| | | 23rd cousin 54 times removed |
| Constantious, II | WFT Est. 286-315 | 51st great-grandfather |
| Constantious, III | WFT Est. 311-352 | 50th great-grandfather |
| Constantius I Emperor Of Rome | 242 | 53rd great-grandfather |
| Corbred | WFT Est. Bef. 188 | 60th great-grandfather |
| | | 11th cousin 66 times removed |
| Corbred, I | WFT Est. Bef. 100 | 64th great-grandfather |
| | | 7th cousin 70 times removed |
| Corbred, II | WFT Est. Bef. 100 | 63rd great-grandfather |
| | | 8th cousin 69 times removed |
| Cornelius, Augustine | WFT Est. 1745-1772 | Husband of the 4th great-grandaunt |
| Cornelius, William | 1766 | Husband of the 4th great-grandaunt |
| Cornellius, Rebecca | July 25, 1773 | 4th great-grandmother |
| Cox, William | WFT Est. 1789-1811 | Husband of the 1st cousin 5 times removed |
| Crane, Elva | October 17, 1862 | Wife of the great-granduncle |
| Crawford, Elder Or Mary | WFT Est. 1714-1739 | 5th great-grandmother |
| Crinan, Lord Of The Isles, Abbot Of Dunkeld | WFT Est. 950-979 | 31st great-grandfather |
| Cross, Helen Of The | 248 | 53rd great-grandmother |
| Crosswhite, Goldena | | Wife of the granduncle |
| Cruthach, Caesair, French Princess | WFT Est. Bef. 100 | 79th great-grandmother |