Cognomen Utsahaphan (Utsahaphan 
) , in the entire world, is a very rare last name. The surname Utsahaphan is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Utsahaphan | Thailand |
Oratai, Supashan, and Jirutchaya