Cognomen ไอถิน (Aithin 
, ไอถิน ) , in the world, is a very rare family name. The family name ไอถิน is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Also, ไอถิน is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Aithin | Tanzania, India, Thailand |
| ไอถิน | Thailand |