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Family name Chaijum (Chaijum ) , all over the world, is a very rare cognomen. The surname Chaijum is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Chaijum | Thailand |
Gasara, Suwanan, Koranut, Sasithorn, and Watcharaphong