Cognomen Theyser (Theyser 
) , worldwide, is a very rare family name. The last name Theyser is characteristic of South Africa, where it is a very rare surname, and Mexico, where it is an extremely rare surname. Much less frequently, Theyser is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Theyser | Mexico, South Africa |