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Family name Janthasan (Janthasan ) , in all the world, is a very rare surname. The cognomen Janthasan is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Janthasan | Thailand |
Saranya, Pantita, Weechanee, Ratthaphum, and Atcharaphon