Family name Simonai (Simonai 
) , in the world, is an extremely rare cognomen. The last name Simonai is characteristic of Lithuania, where it is a rare surname, and Brazil, where it is an extremely rare surname. Likewise, Simonai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Simonai | Brazil, United States, Lithuania, South Africa |