Last name Tonaj (Tonaj 
) , in the entire world, is a rare family name. The cognomen Tonaj is characteristic of Albania, where it is quite a rare surname, Croatia, where it is a rare surname, and Canada, where it is a very rare surname. Measured by absolute frequency, this name is the most popular in Albania, the United States, and Croatia. Very seldom, Tonaj is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tonaj | Croatia, United States, India, Canada, Albania |