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Cognomen Thammawitthayaphum (Thammawitthayaphum ) , worldwide, is a very rare family name. The cognomen Thammawitthayaphum is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Thammawitthayaphum | Thailand |
Krittin, Krittanat, Wivatthanachai, Wiwattanachai, and Wiwatthanachai