Hanrahan
An Irish surname most often explained as the Anglicized form of a Gaelic family name linked to the O'Hourihane line.
The #6,141 most common surname in the United States (2010 Census) — about 1 in every 55,351 Americans shares it.
Etymology
Hanrahan is generally treated as an Anglicized Irish surname. The forms cited by older Irish onomastic sources connect it with Gaelic O'Hourihane / O'Hanrahan-type forms, though the historical spelling trail is messy and regional variants overlap. In practical terms, the name belongs to a cluster of related Munster surnames whose Anglicized forms shifted over time between Hanrahan, Hourihane, Hourigan, and related spellings.
History
The surname is found in Irish genealogical and surname reference works from at least the late 19th and early 20th centuries, where it appears alongside related forms such as Hanratty and Hourihane. It is especially associated with Ireland rather than Britain, and modern bearers in the United States reflect later Irish migration. Because older sources often group several surnames together, the exact relationship among the various spellings is not always presented with full certainty.
Origin
Regions
Variant spellings
Fun fact
Older Irish surname books often list Hanrahan in the same cluster as Hourihane, Hourigan, Horan, and Horgan, showing how fluid Anglicized Irish spellings could be.
From the historical record
“0 hAn|iACAiTi, O'Hanrahan, Hanrahan, Handrahan. 0 liAXn|iACCAi5, Hanratty. 0 ViAniiA-uAin, O'Hanrahan,”
— Sloinnte Gaedheal is Gall: Irish names and surnames