Surname Udso (Udso 
) , throughout the world, is a very rare last name. The cognomen Udso is habitual in Estonia, where it is quite a rare surname, Finland, where it is a very rare surname, and Thailand. Much less frequently, Udso is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Udso | Estonia, Philippines, Brazil, Thailand, Finland |