Family name Phattharasai (Phattharasai 
) , across the world, is an extremely rare surname. Much more prevalently, Phattharasai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Phattharasai | Thailand |
Saehoe, Muentuem, Chommanee, and Phattharaphiphat