Family name Leoniec (Leoniec 
) , around the world, is a very rare surname. The family name Leoniec is habitual in Ireland, where it is a rare surname, Poland, and Germany, where it is an extremely rare surname. More prevalently, Leoniec is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Leoniec | United States, Germany, Poland, Ireland |
| paweł leoniec Polish opera singer (1921-2017), PL (b. 1921) |
|