Cognomen Amornwikaikul (Amornwikaikul 
) , globally, is a very rare last name. The cognomen Amornwikaikul is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Amornwikaikul | Thailand |
Paisit, Songrit, Nusaraporn, Udomchai, and Bootsaraporn