Family name Bacius (Bacius 
) , in the world, is a very rare last name. The surname Bacius is habitual in Lithuania, where it is quite a rare surname, Germany, where it is an extremely rare surname, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Bacius | Brazil, Lithuania, Germany, United States |
| bacius ugolini Roman Catholic clergyman |
|