Last name Szelényi (Иштван 
, Szelényi 
) , in the world, is a very rare cognomen. The cognomen Szelényi is characteristic of Hungary, where it is a rare surname, Russia, where it is an extremely rare surname, and Germany. More prevalently, Szelényi is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Иштван | Kazakhstan, Russia, Belarus, Serbia, Ukraine |
| Szelényi | Germany, Hungary |
| szelényi lajos HU (b. 1794) |
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szelényi emília HU (b. 1858) |
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szelényi ödön Hungarian journalist, HU (b. 1877) |
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szelényi iván Hungarian sociologist, HU (b. 1938) |
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| szelényi istván Hungarian composer and pianist, HU (b. 1904) |
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| szelényi gusztáv HU (b. 1904) |
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| szelényi imre rudolf HU (b. 1906) |
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szelényi zsuzsanna Hungarian politician, HU (b. 1966) |
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| szelényi ferenc HU (b. 1909) |
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| zoltán szelényi (b. 1940) |
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| szelényi károly HU (b. 1943) |
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| szelényi anna (b. 1957) |
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| péter szelényi researcher |
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| szelényi zoltán Hungarian veterinarian, researcher, HU |
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| katalin szelényi (b. 1974) |
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