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.
| VARIANT | COUNTRY |
|---|---|
| Catháin | Ireland, United Kingdom |
| ruaidhrí dall ó catháin Irish harper and composer, IE (b. 1600) |
|
|
| séamas ó catháin (b. 1779) |
|
|
| pádraig ó catháin Irish radio broadcaster, IE |
|
|
| padraig ó catháin Ph.D. National University of Ireland, Galway 2012 |
|
|
| ciarán ó catháin researcher |
|
|
| máirtín ó catháin |
|
|
| cú maighe na ngall ó catháin |
|
|
| eoin ó catháin |
|