Surname Seselja (Seselja 
) , in all the world, is a very rare cognomen. The surname Seselja is characteristic of Croatia, where it is a rare surname, Australia, and Canada, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Australia, Italy, and Canada. Much less frequently, Seselja is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Seselja | Australia, Croatia, Italy, Canada, Peru |