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Last name Boonyao (Boonyao ) , all over the world, is a rare cognomen. The cognomen Boonyao is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Boonyao | Thailand |
Lim, Kanokaon, Phitthaya, Gandhicha, Nuttawoot, Kiadtikhun, and Pheeraphat