Cognomen Udvarhelyi (Udvarhelyi 
) , around the world, is a rare last name. The last name Udvarhelyi is characteristic of Hungary, where it is quite a rare surname, Romania, where it is a rare surname, and Austria. Measured by absolute frequency, the name is most common in Hungary, Romania, and the United States. Very seldom, Udvarhelyi is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Udvarhelyi | Austria, Canada, United States, Romania, Hungary |
| mihály udvarhelyi RO (b. 1670) |
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udvarhelyi miklós Hungarian actor, singer, theatre manager and director (1792-1864), HU (b. 1792) |
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| udvarhelyi sándor Hungarian opera singer (bass) and actor, HU (b. 1815) |
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| udvarhelyi károly HU (b. 1903) |
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| nándor udvarhelyi HU (b. 1957) |
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| péter udvarhelyi researcher (ORCID 0000-0002-7073-1664) |
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| anikó udvarhelyi researcher |
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| éva tessza udvarhelyi (b. 1980) |
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Mr, Glenn, Tibor, Emese, Vicki, Zsolt, Martin, Marynn, Monika, Anikó, Amanda, Balazs, Balint, Kornel, Kristy, Klára, Gábor, Laszlo, Travis, Eszter, Enikő, Zoltan, Gabor, Zoltã, Donna, Peter, Ms, Pal, Las, Eva, Ian, Andy, Anna, Adam, Bogi, Kata, Pál, John, Jeff, Judy, Tory, Troy, Erin, Marta, Carol, Csaba, Petra, Réka, and Ádám