Surname Ostertag (Ostertag 
, Остертаг 
) , around the globe, is quite a common family name. The surname Ostertag is habitual in Paraguay, where it is quite a common surname, Slovakia, where it is quite a rare surname, and Germany. Not in comparison with a country's population, it most frequently occurs in Germany, Argentina, and Paraguay.
| VARIANT | COUNTRY |
|---|---|
| Ostertag | Germany, Paraguay, United States, Argentina, France |
| Остертаг | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
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valentin ostertag German jurist, DE (b. 1450) |
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| ostertag von lustnau DE (b. 1400) |
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| hans jakob ostertag (1629-1650), CH (b. 1629) |
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| georg adam ostertag German executioner (1675-1743), DE (b. 1675) |
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| johann philipp ostertag German classical philologist and teacher (1734-1801), DE (b. 1734) |
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| marie-eve ostertag (1738-1812), CH (b. 1738) |
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| wilhelm friedrich ostertag (b. 1768) |
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| marie elisabethe ostertag DE (b. 1774) |
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| johann friedrich ostertag German author, DE (b. 1803) |
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| carl friedrich ostertag (b. 1798) |
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| karl ostertag DE (b. 1798) |
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| maria magdalena ostertag (b. 1808) |
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| adam friedrich thomas ostertag (b. 1808) |
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| albert ostertag (b. 1810) |
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blanche ostertag American artist, US (b. 1872) |
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