Family name Khantathasiri (Khantathasiri 
) , globally, is a very rare cognomen. The surname Khantathasiri is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Khantathasiri | Thailand |
Kaowkal, Thananya, Thanattha, Thanatkal, and Thananchai