Allen

Origin & Meaning

The name Allen in Ireland has at least two Gaelic origins and one Norman origin, which accounts for its wide distribution across the island. The most historically significant Gaelic root is Ó hAlláin, a family from Connacht whose territory lay around County Galway. A separate Mac Alláin sept was present in Leinster, particularly in County Kildare — not far from the famous Curragh of Kildare and the Hill of Allen, which gave its name to the legendary warrior-poet Fionn Mac Cumhaill's stronghold.

The Hill of Allen (Almu in Old Irish) was the mythological seat of the Fianna, the warrior band of Irish legend. Whether the Allen surname carries any connection to this storied place is debated by scholars, but the coincidence of name and landscape has long coloured how Irish people relate to the Allen surname.

A third and significant strand came with the Norman conquest of 1169–1172. Norman settlers named d'Alein or de Alyn settled in Ireland, particularly in Leinster, and their descendants Gaelicised over generations, intermarrying with the native population. By the 17th century, it was often impossible to distinguish Gaelic Allens from Norman Allens in the documentary record.

History & Notable Bearers

Ireland has produced notable Allens across several centuries. William Allen (1532–1594), born in Lancashire but of Irish connections, founded the English College at Douai and was made a Cardinal by Pope Sixtus V — his work sustained Catholic learning during the Reformation. Lough Allen, the northernmost of the three Shannon lakes in County Leitrim, takes its name from a local territory, and remains a place of pilgrimage for those researching Connacht Allen roots.

In modern Ireland, the Allen name appears across public life. The Irish-American Allen family of Boston, many of whom traced roots to County Galway, made significant contributions to Massachusetts politics and education in the 19th century. In sport, the Allens of County Cork contributed to GAA football through several generations.

The Allen Diaspora

Allen is one of the most commonly found Irish surnames in the United States, particularly in New England, the Mid-Atlantic states, and the American South. The Great Famine of 1845–1852 sent waves of Galway and Leinster Allens across the Atlantic, settling in Boston, New York, Philadelphia, and beyond.

In Australia, the Allen family is well established in New South Wales and Victoria, where Galway emigrants dominated the 1840s–1860s transportation lists. Canada received significant Allen immigration, particularly in Ontario and Prince Edward Island, where communities of Irish descent with the Allen surname remain identifiable today.

Genealogy Research

Irish genealogy records

The 1901 and 1911 Irish Census records, searchable free at census.nationalarchives.ie, show Allen families concentrated in Connacht and Leinster. For pre-Famine research, Catholic parish registers accessed through RootsIreland.ie are essential.

Civil registration records

Civil registration of births, marriages, and deaths began in Ireland in 1864. The General Register Office index is searchable at IrishGenealogy.ie — a free resource covering most of Ireland.

American Allen research

Irish-born Allens in US Census records (1850–1930) often list a birthplace of "Ireland" only. Naturalisation papers, passenger manifests, and obituaries from Boston and New York Irish newspapers of the 1850s–1880s often specify the county of origin and are worth searching at your local Family History Center.