Around the world, Eustaqui (Eustaqui 
) is a very rare largely male, but infrequently feminine first name. The forename Eustaqui is habitual in South-eastern Asia, particularly Philippines, where it is a very rare epicene name. Also, Eustaqui is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Eustaqui | Spain, Philippines, Argentina, Brazil, Venezuela |
Efstathios, Eustac, Eustacchio, Eustace, Eustach, Eustache, Eustachio, Eustachy, Eustacio, Eustacius, Eustacjusz, Eustahije, Eustaquio, Eustasio, Eustasius, Eustathios, Eustazio, Eustazy, Eustațiu, Eustácio, Eustáquio, Evstafy, Evstahij, Ostap, Stathis, Ευστάθιος, Στάθης, Астафий, Евстатий, Евстафий, Евстахий, Остап, Остафий, Стафей, Эсташ, Юстас, and Євстафій