| Name | Relationship with Gilbert de Clare | Civil | Canon |
|---|
| Fiero, Emily | 21st great-granddaughter | XXIII | 23 |
| Firth, Annie Robb | 21st great-granddaughter | XXIII | 23 |
| Firth, Austin Montgomery | 20th great-grandson | XXII | 22 |
| Firth, Caroline | 19th great-granddaughter | XXI | 21 |
| Firth, Caroline | 20th great-granddaughter | XXII | 22 |
| Firth, Charles Robb | 20th great-grandson | XXII | 22 |
| Firth, Elizabeth | 19th great-granddaughter | XXI | 21 |
| Firth, Elizabeth Carpenter | 19th great-granddaughter | XXI | 21 |
| Firth, Ezra | Husband of the 17th great-granddaughter | | |
| Firth, Ezra Gibbs | 19th great-grandson | XXI | 21 |
| Firth, Franklin Jones | 20th great-grandson | XXII | 22 |
| Firth, Hannah | 18th great-granddaughter | XX | 20 |
| Firth, Hannah Hedge | 19th great-granddaughter | XXI | 21 |
| Firth, Hannah Jones | 19th great-granddaughter | XXI | 21 |
| Firth, Harry | 20th great-grandson | XXII | 22 |
| Firth, Henry Heberton | 21st great-grandson | XXIII | 23 |
| Firth, John | 18th great-grandson | XX | 20 |
| Firth, John | 19th great-grandson | XXI | 21 |
| Firth, Lucas Smith | 19th great-grandson | XXI | 21 |
| Firth, Maria Carpenter | 19th great-granddaughter | XXI | 21 |
| Firth, Mary | 19th great-granddaughter | XXI | 21 |
| Firth, Preston Carpenter | 18th great-grandson | XX | 20 |
| Firth, Samuel | 18th great-grandson | XX | 20 |
| Firth, Samuel Lloyd | 21st great-grandson | XXIII | 23 |
| Firth, Samuel Robb | 20th great-grandson | XXII | 22 |
| Firth, Sarah | 19th great-granddaughter | XXI | 21 |
| Firth, Sarah | 19th great-granddaughter | XXI | 21 |
| Firth, Thomas | 18th great-grandson | XX | 20 |
| Firth, Thomas T. | 21st great-grandson | XXIII | 23 |
| Firth, Thomas Thompson | 19th great-grandson | XXI | 21 |
| Fish, Edward Van Alstyne | 22nd great-grandson | XXIV | 24 |
| Fish, Louis Washburn | 22nd great-grandson | XXIV | 24 |
| Fish, Mary Washburn | 22nd great-granddaughter | XXIV | 24 |
| Fish, William Henry | Husband of the 21st great-granddaughter | | |
| Fishbourne, Hannah | Wife of the 15th great-grandson | | |
| FitzAlan, Richard | Husband of the 2nd great-granddaughter | | |
| FitzMaurice, Juliana | Wife of the grandson | | |
| Flitcraft, Ruth Roberts | 21st great-granddaughter | XXIII | 23 |
| Flitcraft, Warren | Husband of the 20th great-granddaughter | | |
| Flynn, Thomas | Husband of the 21st great-granddaughter | | |
| Ford, George | Husband of the 19th great-granddaughter | | |
| Fothergill, Ann | Wife of the 19th great-grandson | | |
| Fox, Lois | Wife of the 21st great-grandson | | |
| Frankel, Ernestine Wilhelmina | Wife of the 20th great-grandson | | |
| Frost, Annie E. | Wife of the 20th great-grandson | | |
| Frye, Anthony Robert | 24th great-grandson | XXVI | 26 |
| Frye, James Walter | 24th great-grandson | XXVI | 26 |
| Frye, Lori Ellen | 24th great-granddaughter | XXVI | 26 |
| Frye, Teri Lynette | 24th great-granddaughter | XXVI | 26 |
| Frye, William | Husband of the 23rd great-granddaughter | | |
