Family name Sinek (Sinek 
, Синек 
, סינק 
) , all around the world, is a rare last name. The surname Sinek is habitual in Croatia, where it is a rare surname, Czechia, and Romania. In absolute terms, it most frequently occurs in Indonesia, the United States, and Romania. Likewise, Sinek is the forename as well as the last name.
| karoline sinek holocaust victim, b. 1861-08-21, CZ (b. 1861) |
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| bohumil sinek holocaust victim, b. 1871-02-25, CZ (b. 1871) |
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| karel sinek holocaust victim, b. 1876-01-15, CZ (b. 1876) |
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| oskar sinek holocaust victim, b. 1876-03-14, CZ (b. 1876) |
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| rudolf sinek holocaust victim, b. 1876-01-05, CZ (b. 1876) |
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| leo sinek holocaust victim, b. 1881-04-30, CZ (b. 1881) |
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| viktor sinek holocaust victim, b. 1882-11-08, CZ (b. 1882) |
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| bedřich sinek holocaust victim, b. 1900-01-07, CZ (b. 1900) |
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| františek sinek holocaust victim, b. 1900-05-07, CZ (b. 1900) |
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| bedřich sinek holocaust victim, b. 1909-10-05, CZ (b. 1909) |
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| franz sinek CZ (b. 1900) |
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| robert sinek holocaust victim, b. 1911-08-14, CZ (b. 1911) |
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simon oliver sinek British/American author and motivational speaker, GB (b. 1973) |
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| charles sinek figure skater, US (b. 1968) |
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| scott sinek college basketball player (1982–1985) Brigham Young |
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