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Cognomen Ruangthap (Ruangthap ) , all over the world, is a very rare surname. The cognomen Ruangthap is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Ruangthap | Thailand |
Jintana, Onanong, Wittaya, Natthika, Nimitchai, Thipphawan, and Watcharakorn