Cognomen Udayasen (Udayasen 
) , in all the world, is a very rare family name. The surname Udayasen is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, Udayasen is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Udayasen | Thailand, India |