Last name Eustáquio (Eustaquio 
, Eustachius 
, Eustáquio 
) , worldwide, is a common cognomen. The family name Eustáquio is characteristic of Spain, where it is quite a common surname, Mexico, where it is quite a rare surname, and Peru. Measured by absolute frequency, the name is most common in Mexico, Philippines, and Spain. Also, Eustáquio is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Eustaquio | Argentina, Spain, Mexico, Philippines, Brazil |
| Eustachius | Tanzania, United States, Indonesia, Germany, Brazil |
| Eustáquio | United States, Portugal, Canada, Brazil |
Efstathios, Eustac, Eustacchio, Eustace, Eustach, Eustache, Eustachio, Eustachy, Eustacio, Eustacius, Eustacjusz, Eustahije, Eustaqui, Eustasio, Eustasius, Eustathios, Eustazio, Eustazy, Eustațiu, Eustácio, Evstafy, Evstahij, Ostap, Stathis, Ευστάθιος, Στάθης, Астафий, Евстатий, Евстафий, Евстахий, Остап, Остафий, Стафей, Эсташ, Юстас, and Євстафій
| antonio eustáquio person identified in the Museu da Pessoa collection, BR (b. 1960) |
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| alessandra s eustáquio researcher |
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| zélia eustáquio |
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| stephen eustáquio association football player, CA (b. 1996) |
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