Cognomen Birkmanis (Birkmanis 
) , across the world, is a rare surname. The last name Birkmanis is characteristic of Northern Europe, particularly Latvia, where it is quite a rare surname, Estonia, where it is a rare surname, and Lithuania. In absolute terms, this name is the most popular in Latvia, Australia, and Lithuania.
| VARIANT | COUNTRY |
|---|---|
| Birkmanis | Estonia, Latvia, Lithuania, Australia, United States |
| gunārs birkmanis (b. 1931) |
|