Cognomen Catháin (Catháin 
) , all over the world, is a very rare last name. The cognomen Catháin is habitual in Northern Europe, particularly Ireland, where it is a rare surname, and the United Kingdom, where it is an extremely rare surname.
| ruaidhrí dall ó catháin Irish harper and composer, IE (b. 1600) |
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| séamas ó catháin (b. 1779) |
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| pádraig ó catháin Irish radio broadcaster, IE |
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| padraig ó catháin Ph.D. National University of Ireland, Galway 2012 |
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| ciarán ó catháin researcher |
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| máirtín ó catháin |
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| cú maighe na ngall ó catháin |
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| eoin ó catháin |
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