Family name Opat (Абат 
, Opat 
, אבא 
) , across the world, is quite a rare last name. The cognomen Opat is habitual in Croatia, where it is quite a rare surname, Slovakia, and Kyrgyzstan, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in Indonesia, the United States, and Croatia. More frequently, Opat is the forename as well as the last name.
| antonín opat (b. 1911) |
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| jaroslav opat Czech philosopher and historian (1924-2015), CZ (b. 1924) |
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| bohumil opat CZ (b. 1921) |
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| geoffrey opat Australian physicist and philanthropist (b. 1935) |
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| mike opat American politician, US (b. 1961) |
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| valérie opat French politician, FR (b. 1968) |
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| stephen opat researcher |
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| františek opat Righteous Among the Nations, CZ |
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