Kavanaugh
An anglicized Irish surname from Gaelic names meaning “descendant of Cavanagh,” with roots likely tied to a personal name or a word for a hound-like figure.
The #6,109 most common surname in the United States (2010 Census) — about 1 in every 55,025 Americans shares it.
Etymology
Kavanaugh is the anglicized form of an Irish surname, commonly traced to Gaelic Ó Caomhánach or related forms. The name is often explained as “descendant of Caomhánach,” from a personal byname based on caomh, meaning “gentle,” “pleasant,” or “beloved.” In some older scholarship, the name was also connected with a nickname or tribal label rather than a straightforward occupation or place-name.
History
The surname is strongly associated with Ireland, especially Leinster and adjoining areas, and it became established in English spelling through successive anglicizations such as Cavanagh, Kavanagh, and Kavanaugh. In the United States, the Kavanaugh spelling is a later and less common variant compared with Kavanagh and Cavanagh, often reflecting regional spelling preferences in immigrant records. The provided 19th-century source excerpt only confirms the name’s circulation in surname lists, not its origin.
Origin
Regions
Variant spellings
Fun fact
Kavanaugh is one of several Irish surnames whose English spellings vary widely, even among branches of the same family.
From the historical record
“and Kaplin, Karcher, Kassel, Kastner, Kating and Keating, Kavanaugh, Kays, Keach and Keech, Kealey, Kean and Keane, Keany, Kearnan, Kear- ney, Keay, Kebbons, Keeby, Keefe, Keegan, Keelan, Keeler, Keeley, Keenahan, Keenan, Keene, Keevan, Keeyer, KEHE^Y, Kehl, Kehoe, Keiler, Keilig, Keiling, Keily, Keirnan, Keith,”
— Suffolk Surnames (3rd ed.)