Throughout the world, Eustachio (Eustachio 
) is quite a rare male first name. The given name Eustachio is characteristic of Italy, where it is quite a rare male name, Brazil, where it is a very rare male name, and Germany. Not in comparison with a country's population, this name is the most popular in Italy, Brazil, and the United States. Very seldom, Eustachio is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Eustachio | Germany, Italy, United States, France, Brazil |
Efstathios, Eustac, Eustacchio, Eustace, Eustach, Eustache, Eustachi, Eustachy, Eustacio, Eustacius, Eustacjusz, Eustahije, Eustaqui, Eustaquio, Eustasio, Eustasius, Eustathios, Eustazio, Eustazy, Eustațiu, Eustáchio, Eustácio, Eustáquio, Evstafy, Evstahij, Ostap, Stathis, Ευστάθιος, Στάθης, Астафий, Евстатий, Евстафий, Евстахий, Остап, Остафий, Стафей, Эсташ, Юстас, and Євстафій
Eustachio is also a name for the fictitious and mythical characters: Eustachio de Saint-Pierre , the operatic character in the opera L’assedio di Calais, L'assedio di Calais.
| eustachio da matera Italian poet, IT (b. 1201) |
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| eustachio celebrino IT (b. 1490) |
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| eustachio romano Italian composer (b. 1521) |
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eustachio divini Italian scientist, IT (b. 1610) |
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| eustachio rudio (b. 1551) |
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eustachio manfredi Italian mathematician, astronomer and poet (1674–1739), IT (b. 1674) |
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eustachio zanotti Italian astronomer and engineer, IT (b. 1709) |
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| eustachio palma Roman Catholic bishop (b. 1676) |
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| eustachio berthoud de malines IT (b. 1693) |
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| eustachio bambini IT (b. 1697) |
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| eustachio cabassi (b. 1730) |
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| eustachio biondelli IT (b. 1731) |
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| eustachio di san francesco IT (b. 1731) |
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| eustachio d'afflitto IT (b. 1742) |
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| eustachio degola Italian writer and presbyter, IT (b. 1761) |
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Neto, Andrulli, Carlucci, Ruggieri, Gaudiano, Lapacciana, Lionetti, Vizziello, Fabrizio, Iacovone, Oliveira, Olivieri, Marcosano, Santarsia, Scalcione, Caporusso, Rodrigues, Rondinone, Lamacchia, Tataranni, Nicoletti, Montemurro, Manicone, Fontana, Venezia, Tarasco, Sarra, Sacco, Silva, Souza, Calia, Bruno, Rizzi, Netto, Festa, Filho, Ambrosecchia, Fiore, Stella, Persia, Pisani, Rubino, Junior, Maragno, Antezza, Coretti, Colucci, Pereira, Santos, and Paolicelli