Across the world, Мацияускас (Мацияускас 
, Matsiyauskas 
) is an extremely rare unknown gender forename. Much more prevalently, Мацияускас is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Мацияускас | Kyrgyzstan, Kazakhstan, Russia, Ukraine |
| Matsiyauskas | Russia, Lithuania |