Surname Poomsak (Poomsak 
) , in all the world, is an extremely rare last name. Much more prevalently, Poomsak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Poomsak | United States, Thailand |
Lamma, Ngamwongwan, Chaitasanangam, Sirawongprasert, Sirianuntapiboon, Limsirivallop, Prathumsiri, Pattayanon, Madeesukstit, Manitayakoon, Wongwachira, Hongsrichinda, Tripopsresakul, Pojanalai, Klinkulab, Boonchumjai, Sinjaroonsak, Juleepong, Liwrungrod, Choochim, Aimmanerut, Supawakul, Nuklaew, Chumsri, Yommai, Horhum, Loypha, Runhan, Ngamwiwattham, and Wongrueangsaeng