Last name Bareisis (Bareisis 
) , in the world, is a rare family name. The surname Bareisis is characteristic of Northern Europe, particularly Lithuania, where it is quite a rare surname, Estonia, where it is a rare surname, and the United Kingdom, where it is an extremely rare surname. Measured by absolute frequency, it is the most numerous in Lithuania, Brazil, and Estonia.
| VARIANT | COUNTRY |
|---|---|
| Bareisis | Brazil, United Kingdom, Lithuania, Estonia |