Gaelic Last Name Generator

From Ó Súilleabháin to O'Sullivan

Nearly every Irish surname you know in English began as a Gaelic phrase. O'Sullivan is Ó Súilleabháin, descendant of the dark-eyed or one-eyed one. McCarthy is Mac Cárthaigh, son of Cárthach, a name meaning loving. O'Connor is Ó Conchobhair, descendant of Conchobhar, and Doyle is Ó Dubhghaill, descendant of the dark foreigner, a term early Irish writers used for Danish Vikings. Each English form is a clerk's attempt to write down what he heard.

Anglicization happened over centuries, pushed by English administration and the Penal Laws, and many families dropped the O' and Mac altogether. Murphy is Ó Murchadha, descendant of the sea warrior, and Kelly is Ó Ceallaigh. In the late nineteenth and early twentieth centuries the Gaelic Revival led many families to restore the prefix, which is why O'Brien and O'Connell are now standard while Murphy and Kelly usually appear without it.

Scottish Gaelic surnames and their English forms

In Scotland the story is similar, but the prefix is almost always Mac. MacDonald is MacDhòmhnaill, son of Domhnall, a name meaning world ruler. MacLeod is MacLeòid, from the Norse name Ljótr, a reminder of the Viking presence in the Hebrides. MacIntyre is Mac an t-Saoir, son of the carpenter, and MacPherson is Mac a' Phearsain, son of the parson. Campbell, Caimbeul in Gaelic, is a nickname meaning crooked mouth rather than a patronymic.

Many Gaelic names contain gille, servant or devotee, often of a saint. Mac Gille Bhrìghde, son of the servant of Saint Brigid, became McBride, and Mac Gille Eathain, son of the servant of Saint John, became MacLean. In Ireland the same pattern gave Mac Giolla Phádraig, anglicized as Fitzpatrick, which swapped the Gaelic prefix for the Norman Fitz. These devotional names suit a character with a religious or clerical backstory.

Women's forms and the Gaelic last name generator

Gaelic surnames change with gender, which surprises many writers. In Irish, a woman from the Ó Súilleabháin family is Ní Shúilleabháin, and a woman from the Mac Cárthaigh family is Nic Chárthaigh. A married woman traditionally used forms like Bean Uí Shúilleabháin, wife of Ó Súilleabháin. Scottish Gaelic uses Nic for daughters of Mac families, so a MacDonald woman is NicDhòmhnaill in Gaelic, although in English she is simply MacDonald.

If you want authenticity, decide whether your character would use the Gaelic or the English form. A modern Dubliner might use Ó Súilleabháin as a statement of identity, while a Boston Irish family would be O'Sullivan without question. Use starts with set to O or Mac, try the length filter for short names like Kane or longer ones, and add a first name such as Aoife, Niamh, Ruairí or Calum to hear the combination.