Last name Ioan Marius (Ioan Marius 
) , in the entire world, is a rare surname. The cognomen Ioan Marius is habitual in Romania, where it is a rare surname, Italy, where it is a very rare surname, and Spain. More prevalently, Ioan Marius is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ioan Marius | Germany, Romania, Italy, Spain, Afghanistan |