Cognomen Watchalotayarn (Watchalotayarn 
) , in the world, is a very rare family name. The family name Watchalotayarn is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Watchalotayarn | Thailand |
Thanawan, Chonticha, and Kritchamol