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Family name Janthasing (Janthasing ) , throughout the world, is a very rare last name. The cognomen Janthasing is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Janthasing | Thailand |
Onsri, Jampee, Jarunan, Weechanee, Kanchalida, and Nattayawadee