Family name Boonprajuk (Boonprajuk 
) , in the entire world, is a very rare last name. The cognomen Boonprajuk is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, Boonprajuk is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Boonprajuk | Thailand |