Surname Boontangjai (Boontangjai 
) , all around the world, is a very rare last name. The surname Boontangjai is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Boontangjai | Thailand |
Chanin, Nabhat, Warangrat, Wichaphas, and Witchaphat