Across the world, Ongpratchayakun (Ongpratchayakun 
) is an extremely rare unknown gender first name. Much more prevalently, Ongpratchayakun is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Ongpratchayakun | Thailand |
Sumon, Pronthakorn, Latdawal, and Ponthakorn