Family name Olsauskas (Olsauskas 
) , worldwide, is a rare surname. The last name Olsauskas is characteristic of Lithuania, where it is quite a rare surname, Estonia, where it is a rare surname, and Poland, where it is a very rare surname. Measured by absolute frequency, it is commonest in Lithuania, Poland, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Olsauskas | Estonia, Poland, Lithuania, United States, Germany |