Surname Osipau (Osipau 
, Осипау 
) , in the entire world, is a rare cognomen. The cognomen Osipau is characteristic of Lithuania, where it is a rare surname, Belarus, and Estonia. Not in comparison with a country's population, it is commonest in Belarus, Russia, and Lithuania.
| VARIANT | COUNTRY |
|---|---|
| Osipau | Estonia, Belarus, United States, Canada, Lithuania |
| Осипау | Russia |
| denis osipau Belarusian freestyle skier, BY (b. 1983) |
|