Surname Eustace (Eustace 
, Ευστάθιος 
, Юстас 
) , throughout the world, is quite a common last name. The cognomen Eustace is characteristic of Ireland, where it is quite a common surname, Barbados, where it is quite a rare surname, and Tanzania. Not in comparison with a country's population, it is commonest in Tanzania, the United States, and the United Kingdom. Also, Eustace is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Eustace | Tanzania, United States, United Kingdom, Kenya, Zambia |
| Ευστάθιος | Greece |
| Юстас | Kazakhstan, Russia, Ukraine |
Efstathios, Eustac, Eustacchio, Eustach, Eustache, Eustachio, Eustachy, Eustacio, Eustacius, Eustacjusz, Eustahije, Eustaqui, Eustaquio, Eustasio, Eustasius, Eustathios, Eustazio, Eustazy, Eustațiu, Eustis, Eustácio, Eustáquio, Evstafy, Evstahij, Ostap, Stathis, Στάθης, Астафий, Евстатий, Евстафий, Евстахий, Остап, Остафий, Стафей, Эсташ, and Євстафій
| thomas eustace, 1st viscount baltinglass Irish noble (b. 1480) |
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| james eustace, 3rd viscount baltinglass Irish noble (b. 1530) |
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| maurice eustace Irish politician (b. 1590) |
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| anna eustace (1681-1754) (b. 1681) |
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| sarah eustace (born 1698) (b. 1698) |
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| thomas eustace (1699-1764) (b. 1699) |
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| sarah eustace (born 1722) (b. 1722) |
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| mary eustace (1724-1779) (b. 1724) |
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| thomas eustace (born 1736) (b. 1736) |
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| charles eustace (1737-1801) (b. 1737) |
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| margaret eustace (1738-1742) (b. 1738) |
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| jane eustace (born 1756) (b. 1756) |
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| john eustace (1758-1760) (b. 1758) |
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| joshua eustace (born 1759) (b. 1759) |
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| benjamin eustace (1761-1833) (b. 1761) |
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