Family name Onesim (Onesim 
) , in all the world, is a rare last name. The cognomen Onesim is characteristic of Romania, where it is a rare surname, France, where it is an extremely rare surname, and Venezuela. Much less frequently, Onesim is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Onesim | Switzerland, Spain, India, Romania, France |