Surname อมรศักดิ์ (อมรศักดิ์ 
, Amornsak 
, Amonsak ) , all around the world, is quite a rare last name. The cognomen อมรศักดิ์ is characteristic of Thailand, where it is quite a rare surname, Australia, where it is a very rare surname, and the United States, where it is an extremely rare surname. More prevalently, อมรศักดิ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| อมรศักดิ์ | Thailand |
| Amornsak | Australia, Thailand, United States, Japan |
| Amorasak, Amonsak | Thailand, United States |
Amonhak, Amonrsak, Amormsak, Amornak, and Amornsakdi