Surname Eustasio (Eustasio 
) , globally, is quite a rare last name. The surname Eustasio is characteristic of Spain, where it is quite a rare surname, Mexico, where it is a rare surname, and Honduras. Measured by absolute frequency, it is commonest in Spain, Mexico, and Venezuela. Likewise, Eustasio is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Eustasio | Mexico, Spain, Paraguay, Brazil, Argentina |
Efstathios, Eustac, Eustacchio, Eustace, Eustach, Eustache, Eustachio, Eustachy, Eustacio, Eustacius, Eustacjusz, Eustahije, Eustaqui, Eustaquio, Eustasius, Eustathios, Eustazio, Eustazy, Eustațiu, Eustácio, Eustáquio, Eustásio, Evstafy, Evstahij, Ostap, Stathis, Ευστάθιος, Στάθης, Астафий, Евстатий, Евстафий, Евстахий, Остап, Остафий, Стафей, Эсташ, Юстас, and Євстафій