Last name Ornstein (Ornstein 
, אורנשטיין ) , around the globe, is quite a rare family name. The surname Ornstein is habitual in Israel, where it is quite a rare surname, Czechia, and Austria, where it is a rare surname. Measured by absolute frequency, the name is most common in the United States, Israel, and Czechia.
| VARIANT | COUNTRY |
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| Ornstein | Czechia, Sweden, Israel, United States, United Kingdom |
| אורנשטיין | Israel |
| moses joshua hoeschel ornstein UA (b. 1774) |
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| jakob meschulam ornstein UA (b. 1775) |
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| bernhard ornstein German-Greek military doctor (1809-1896), DE (b. 1809) |
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| zwi hirsch ornstein UA (b. 1816) |
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leonard salomon ornstein Dutch physicist (1880-1941), NL (b. 1880) |
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| moses ornstein pedagogue and writer, PL (b. 1839) |
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leo ornstein American composer and pianist (1895–2002), US (b. 1893) |
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| karl ornstein Austrian lawyer, AT (b. 1856) |
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| clara ornstein holocaust victim, b. 1861-11-29, AT (b. 1861) |
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| schulim ornstein holocaust victim, b. 1861-09-15, AT (b. 1861) |
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| josef ornstein Holocaust victim, born 1863-06-07, CZ (b. 1863) |
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| mathilde ornstein holocaust victim, b. 1865-10-07, AT (b. 1865) |
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| regine rebekka ornstein holocaust victim, b. 1865-05-27, AT (b. 1865) |
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| samuel ornstein holocaust victim, b. 1868-02-08, CZ (b. 1868) |
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| adolf ornstein (b. 1858) |
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