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Last name Korwanich (Korwanich ) , in all the world, is a rare cognomen. The surname Korwanich is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Korwanich | Thailand |
Patara, Naphat, Jittima, Songkran, Kanyarat, Nutworrakarn, Vorachat, Worachat, Narumanas, Vorachart, Watcharin, Thunchanok, and Chanunchita