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Last name Duanghai (Duanghai ) , in all the world, is a very rare family name. The surname Duanghai is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Duanghai | Thailand |
Phaeo, Oammara, Kitchiwat, Noppanat, and Achittaphon