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Last name Boonjaiyai (Boonjaiyai ) , in the world, is a very rare family name. The cognomen Boonjaiyai is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Boonjaiyai | Thailand |
Ronasak, Jirawut, Amornrat, Tippawan, Sirinthip, Pimpitcha, Ratchaklow, and Kotchaporn