Cognomen Károlyi (Károlyi 
, Karolyi , קארוי 
) , around the world, is quite a rare last name. The last name Károlyi is characteristic of Hungary, where it is quite a common surname, Slovakia, where it is quite a rare surname, and Austria. Not in comparison with a country's population, it is the most numerous in Hungary, Austria, and the United States. Very seldom, Károlyi is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Károlyi, Karolyi | Austria, Germany, Hungary, Slovakia, United States |
| קארוי | Israel |
| mihály károlyi Hungarian nobleman, land owner (b. 1501) |
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| károlyi péter Hungarian reformed pastor (1543-1576), HU (b. 1543) |
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károlyi lászló Hungarian politician and perpetual count (1622-1689), HU (b. 1622) |
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| károlyi zsuzsanna elected Queen Consort of Hungary and Princess Consort of Transylvania, HU (b. 1585) |
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| katalin károlyi Princess Consort of Transylvania, RO (b. 1588) |
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| károlyi ádám HU (b. 1600) |
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károlyi sándor Hungarian soldier, HU (b. 1668) |
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károlyi ferenc Hungarian perpetual count and soldier, HU (b. 1705) |
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| lőrinc károlyi (b. 1688) |
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joseph károlyi Hungarian nobleman (1768-1803), AT (b. 1768) |
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károlyi istván Hungarian politician (1797-1881), HU (b. 1797) |
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károlyi lajos Hungarian lawyer, nobleman (1799-1863), HU (b. 1799) |
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károlyi györgy Hungarian politician (1802-1877), HU (b. 1802) |
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károlyi lajos Hungarian actor and theatre manager, HU (b. 1819) |
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károlyi lászló Hungarian naval officer (1824-1852), HU (b. 1824) |
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Iza, Judit, Tibor, Erika, Ervin, Fanni, Zsolt, Ákos, Martin, Matouš, Márti, Márta, Máté, Andrea, Anikó, Attila, Csilla, Beáta, Bianka, Kincső, Patrik, Péter, Jenő, Lilla, Lenka, Lajos, Albi, Anna, Kata, Klau, Kyra, Pál, Lili, Juli, Edit, Éva, Roland, Márk, Anita, Csaba, Bence, Béla, Kevin, Kinga, Dóra, Gitta, Gyula, Laura, Antal, and Dorina