Surname Ostacia (Ostacia 
) , around the world, is a very rare cognomen. The last name Ostacia is habitual in Latin America and the Caribbean, particularly Nicaragua, where it is a very rare surname, Venezuela, and Mexico, where it is an extremely rare surname. Predominantly, Ostacia is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ostacia | Nicaragua, Democratic Republic of the Congo, Mexico, Brazil, Venezuela |