Top 100 Irish last names explained

Find out more about your Irish roots and where your family name hails from

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IrishCentral.com has put together a list of the top 100 common Irish surnames with a little explanation of where these names come from.

Whether you're looking to trace your family crest or trying to trace your family roots this list will point you in the right direction.

From Aherne to Whelan here is our top 100 Irish names:

Aherne - (Ó hEachtighearna/Ó hEachthairn) (each, steed tightearna, lord). Originally Dalcassian, this sept migrated from east Clare to Co. Cork. In County Waterford the English name Hearn is a synonym of Hearn.

MacAleese - MacGiolla (son of the devotee of Jesus). The name of a prominent Derry sept. There are many variants of the name such as MacIliese, MacLeese, MacLice, MacLise, etc. The best known of this spelling, the painter Daniel MacLise, was a family of the Scottish highlands, know as MacLeish, which settled in Cork.

Allen - This is usually of Scottish or English origin but sometimes Ó hAillín in Offaly and Tipperary has been anglicized Allen as well as Hallion. Occasionally also in Co. Tipperary. Allen is found as a synonym of Hallinan. As Alleyn it occurs frequently in mediaeval Anglo Irish records. The English name Allen is derived from that of a Welsh saint.

MacAteer -  Mac an tSaoir  (saor, craftsman) An Ulster name for which the Scottish MacIntyre, of similar derivation, is widely substituted. Ballymacateer is a place-name in Co. Armagh, which is its homeland. Mac an tSaoir is sometimes anglicized Wright in Fermanagh.

MacAuley - Awley.  There are two distinct septs of this name, viz. MacAmhalghaidh of Offaly and West Meath, and the more numerous MacAmhlaoibh, a branch of the MacGuires which as MacAmhlaoibh gives the form Gawley in Connacht. Both are derived from personal names. The latter must not be confused with MacAuliffe.

MacAuliffe - Mac Amhlaoibh. An important branch of the McCarthys whose chief was seated at Castle MacAuliffe. The name is almost peculiar to south-west Munster.

Barry - de Barra. The majority of these names are of Norman origin, i.e. de Barr (a place in Wales); they became completely hibernicized. Though still more numerous in Munster than elsewhere the name is widespread throughout Ireland. Barry is also the anglicized form of Ó Báire (see under Barr) and Ó Beargha (meaning spear-like according to Woulfe) a small sept of Co. Limerick.

Blake - deBláca (more correctly le Bláca). One of the ‘Tribes of Galway’ an epithet name meaning black which superseded the original Cadell. They are descended from Richard Caddell, Sheriff of Connacht in 1303. They became and long remained very extensive landowners in Co. Galway.  Branch settled in Co. Kildare where their name is perpetuated in three town lands called Blakestown.

Brennan - Ó Braonáin. (The word braon has several meanings, possibly sorrow in this case). The name of four unrelated septs, located in Ossory, east Galway, Kerry and Westmeath. The county Fermanagh sept of Ó Branáin was also anglicized Brennan as well as Brannan.

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