Surname Cathain (Cathain 
) , all around the world, is a very rare family name. The surname Cathain is characteristic of Northern Europe, particularly Ireland, where it is a rare surname, and the United Kingdom, where it is a very rare surname. Very seldom, Cathain is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Cathain | Ireland, India, United Kingdom, United States |
| eoghan ua cathain Irish abbot |
|