What is the Irish from of the last name of Hagan?

Grmma, Sass

Probably "Ó hAodhagán" [pr. ó hay gán]
but wait for people with reference books to confirm it.

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It is recommended that you always wait for three to agree on a translation.
I speak Connemara Irish, and my input will often reflect that.
I will do an mp3 file on request for short translations.
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According to Irish Identity.com, it's Ó hÁgáin.

Crossed with Bríd. Her thought makes a lot more sense to me from a phonetic standpoint.

Redwolf

MacLysaght agrees, but adds, interestingly: "It is fairly well established that this name was originally Ó hÒgáin (from óg, young)", but he does not explain the transition.

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I'm not a native (or entirely fluent) speaker, so be sure to wait for confirmations/corrections, especially for tattoos.

An Sloinnteoir Gaeilge agus an t-Ainmneoir agrees with Ó hÁgáin...

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Bí cinnte de go nglacfaidh triúr le gach aistriúchán a thabharfar.
Be sure to get three in agreement with a translation given.

Grmma a chairde.

I'm just taking a guess but Ó hÓ hAodhagáin (possibly firery one/ or one with hair like fire) might have been an older spelling form of Ó hÁgáin

Ó hÓgáin does make sense too.

Ó hÁgáin- looks like it was made up from the English rather than the other way aroud- Anybody else get that impression.

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Please wait for corrections/ more input from other forum members before acting on advice