Last name Kádár (Kadar 
, Cadar 
, Kádár 
) , around the globe, is a common surname. The surname Kádár is habitual in Hungary, where it is quite a common surname, Romania, and Djibouti (explore the name in all countries). Measured by absolute frequency, it most frequently occurs in India, Hungary, and Algeria. Also, Kádár is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kadar | Hungary, Algeria, India, Romania, Indonesia |
| Cadar | Hungary, Saudi Arabia, India, Romania, Indonesia |
| Kádár | Hungary, Slovakia, United States, Serbia, Romania |
| Кадар | Kyrgyzstan, Kazakhstan, Belarus, Russia, Ukraine |
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kádár lehel HU (b. 1884) |
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kádár gyula Hungarian military personnel, HU (b. 1898) |
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| lajos kádár Hungarian teacher (1854-1894), RO (b. 1854) |
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| józsef kádár RO (b. 1850) |
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kádár jános former General Secretary of the Hungarian Socialist Workers' Party, HU (b. 1912) |
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| kádár imre HU (b. 1854) |
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| géza kádár painter (1876-1952), RO (b. 1876) |
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| kádár béla Hungarian artist (1877–1956), HU (b. 1877) |
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kádár flóra Hungarian actress, HU (b. 1928) |
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kádár béla Hungarian economist and politician, HU (b. 1934) |
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| kádár endre Hungarian writer (1887-1944), HU (b. 1887) |
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| kádár lívia Hungarian painter (1894-1985), HU (b. 1894) |
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| kádár lajos Hungarian writer (1896-1982), HU (b. 1896) |
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tibor kádár f. Hungarian-Romanian painter, RO (b. 1946) |
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| kádár piroska Hungarian actress, HU (b. 1899) |
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