Family name Greangsak (Greangsak 
) , worldwide, is an extremely rare cognomen. Much more prevalently, Greangsak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Greangsak | United States, Thailand |
Mamut, Jongolnee, Gaewpinij, Tongsiri, and Vipasrinimit