Taken from "Irish Pedigrees", referring to manuscripts kept at the Trinity College Library in Dublin, Ireland. According to E.3.2, the following were among the principal families in Ireland towards the close of the 16th, and beginning of the 17th century; in the reigns of Queen Elizabeth, King James I, and Charles I; fragments of some of whose genealogies, traced down to the middle of the reign of Queen Elizabeth, are given in the volume."
| Surnames Prevalent In 16th Century Ireland |
| Ailmer |
| Allen |
| Arralt |
| Ash |
| Ashe |
| Aspoll |
| Aylmer |
| Ayshe |
| Baggott |
| Babe |
| Balfe |
| Balffe |
| Ballard |
| Balle |
| Barbe |
| Barclyfe |
| Barnewall |
| Barnewell |
| Barre |
| Barry |
| Basnet |
| Bassuet |
| Bath |
| Bathe |
| Bayliffe |
| Bege |
| Begg |
| Begge |
| Beling |
| Belinge |
| Bellew |
| Bellewe |
| Belynge |
| Berford |
| Berth |
| Betah |
| Betahe |
| Bethell |
| Balke |
| Balkney |
| Blancefeld |
| Boghan |
| Boidy |
| Boir |
| Boix |
| Bourk |
| Boyd |
| Boyse |
| Boyv |
| Brade |
| Brandon |
| Brassell |
| Brassill |
| Brassin |
| Bremingham |
| Bremyngham |
| Brenan |
| Brenne |
| Brice |
| Brien |
| Brone |
| Brookton |
| Browne |
| Brymingham |
| Buckley |
| Burgis |
| Burnel |
| Burnell |
| Butler |
| Byrte |
| Byrtt |
| Bush |
| Caddell |
| Cale |
| Canamrahge |
| Carney |
| Carre |
| Cashall |
| Cashell |
| Casshol |
| Cath |
| Cavanagh |
| Chamerlyn |
| Charles |
| Chelton |
| Cheneross |
| Cherlis |
| Chever |
| Chiver |
| Clynch |
| Clynton |
| Comerfo |
| Compton |
| Conors |
| Cornewalles |
| Cresey |
| Crompe |
| Cruce |
| Cruice |
| Cruyce |
| Culduffe |
| Cusacke |
| Cusake |
| Custard |
| Darcey |
| Darcy |
| Darcye |
| De Exeter |
| Delafield |
| Delafelde |
| Dalahid |
| Delahoid |
| Delahoide |
| Delahyd |
| Delvin |
| De More |
| Dempsey |
| Dempsie |
| Dennes |
| Deveros |
| Deveroux |
| Deveroy |
| Dillon |
| Dollard |
| Donel |
| Dongan |
| Doudall |
| Dowdall |
| Dowden |
| Dowlinge |
| Downen |
| Dracot |
| Drake |
| Drungoule |
| Duffe |
| Durran |
| Dyloon |
| Dyllonne |
| Ecclin |
| Elyot |
| Erward |
| Eustace |
| Everard |
| Erward |
| Famod |
| Fane |
| Fannid |
| Fay |
| Faye |
| Feld |
| Ffeekyns |
| Ffeldes |
| Ffitzgerrot |
| Ffitzgirald |
| Ffitzjohn |
| Ffitzleons |
| Ffitzmoris |
| Ffitzsimon |
| Fitzsimons |
| Ffitzwilliam |
| Fflattesbere |
| Fflattesberry |
| Flemyng |
| Ffool |
| Fforde |
| Fforster |
| Ffoster |
| Ffyan |
| Ffynglas |
| Fitzgerlad |
| Fitzgerot |
| Fitzjames |
| Fitzjohn |
| Fitzleonard |
| Fitzleons |
| Fitzlions |
| Fitzmoris |
| Fitzmorish |
| Fitzmorys |
| Fitzphillip |
| Fitzpillys |
| Fitzrichard |
| Ritzrobert |
| Fitzstephens |
| Fitzwilliam |
| Flatesbery |
| Felemynge |
| Flotter |
| Forde |
| Fore |
| Foster |
| Furlonge |
| Galball |
| Galrick |
| Garney |
| Geraldyn |
| Gellos |
| Gerland |
| Gerot |
| Gerrot |
| Geyton |
| Gogan |
| Golding |
| Goodman |
| Graye |
| Gware |
| Gybon, The White Knight |
| Hackensall |
| Hacket |
| Hadesore |
| Halpenny |
| Hamlyn |
| Harbart |
| Harold |
| Harrson |
| Hetherton |
| Hobbert |
| Hodge |
| Hollywood |
| Holywood |
| Husse |
| Hussey |
| Hylle |
| Ians |
| Ivers |
| Janico |
| Jenico |
| Jordan |
| Kane |
| Karney |
| Keling |
| Kelley |
| Kelly |
| Kenedy |
| Kenlep |
| Kenley |
| Kent |
| Kenton |
| Keppocke |
| Keppoge |
| Kerdiffe |
| Kerdyffe |
| Ketinge |
| Kylbridge |
| Kyry |
| Lach |
| Laggah |
| Lastartan |
| Lawles |
| Ledwich |
| Ledwithe |
| Ley |
| Loftus |
| Long |
| Luttrell |
| Lynam |
| Lync |
| Lynch |
| Lynet |
| Lynnan |
| Lynor |
| Manly |
| Mappe |
| Marward |
| Maston |
| McCarte Reagh |
| McDonogh |
| McGerrot |
| McGylpatrick |
| McHerryn |
| McMahoun |
| McMahoune |
| McMorcho |
| McMorish |
| McMorris |
| McShane |
| McThomas |
| McWaddock |
| Meldon |
| Meye |
| Michell |
| Misset |
| Moghan |
| Molmoy |
| Money |
| Moore |
| Morish |
| Morishy |
| Mullenes |
| Mysset |
| Nangell |
| Nangle |
| Netterville |
| Nettervyll |
| Neugent |
| Norman |
| Nugent |
| O'Bren |
| O'Bryne |
| O'Carrol |
| O'Coffe |
| O'Connor |
| O'Connor Kyry (Kerry) |
| O'Conor |
| Ocre |
| O'Dempsie |
| Odom |
| Offarrol |
| O'Ffarroll |
| O'Hart |
| O'Hely |
| Oliver |
| O'Lonea |
| O'Malayglen |
| O'Moore |
| O'Neile |
| O'Neill |
| O'Neyle |
| O'Rorke |
| O'Sshee |
| O'Sowlevan |
| Owen |
| Passeunt |
| Penteney |
| Penteny |
| Peppard |
| Petit |
| Petite |
| Pheipo |
| Phepo |
| Pinkeston |
| Plunket |
| Porter |
| Potyng |
| Power |
| Prelion |
| Prendergast |
| Preston |
| Prolfot |
| Protfot |
| Proutfot |
| Purdon |
| Queytrot |
| Ranson |
| Rede |
| Rely |
| Rewdell |
| Reyloy |
| Rocheford |
| Rochford |
| Rotlen |
| Rovelle |
| Row |
| Rowe |
| Russell |
| Sale |
| Sare |
| Sarsfeld |
| Scorloke |
| Sedgrave |
| Segrave |
| Selgrave |
| Shelton |
| Shergold |
| Sherlok |
| Sodgrove |
| Sotton |
| South |
| Stanihurst |
| Stanley |
| Stanton |
| Starke |
| St. Lawrence |
| Stokes |
| Strangewaies |
| Strangways |
| Suirlock |
| Sutton |
| Swarth |
| Talbot |
| Talcher |
| Talon |
| Tanclory |
| Tathe |
| Tatlye |
| Taylor |
| Tellynge |
| Telyn |
| Telyng |
| Telynge |
| Toben |
| Toole |
| Torran |
| Travers |
| Tue |
| Tuit |
| Tuyt |
| Tyr |
| Ussher |
| Veldon |
| Verdon |
| Waffer |
| Wakley |
| Waller |
| Wallingford |
| Walsh |
| Walshe |
| Ware |
| Warren |
| Wassold |
| Weeles |
| Weelleslie |
| Wellesly |
| Wellisle |
| Wellisley |
| Wellysley |
| Wellysly |
| Were |
| Wesley |
| Whitt |
| Whitte |
| Wicomb |
| Wicombe |
| Willeby |
| Wiseman |
| Wogan |
| Woodlock |
| Woodlocke |
| Wycombe |
| Wyes |