Last name Trto (Trto 
) , in all the world, is a very rare surname. The cognomen Trto is characteristic of Croatia, where it is a rare surname, Austria, and Norway. In absolute terms, it most frequently occurs in Austria, the United States, and Croatia. Much less frequently, Trto is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Trto | Norway, Austria, Croatia, Germany, United States |