Family name Phermsak (Phermsak 
) , globally, is an extremely rare cognomen. Predominantly, Phermsak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Phermsak | Thailand |
Kulmat, Joomao, Rohidtsatian, Lilakul, Jeenton, Sangsith, Phanphak, Rohidsatian, Noptheepkangwan, Warakunwit, Chariamphan, Kerdwichian, and Yaowakulpattana