Last name Gacs (Gacs 
) , in the entire world, is a rare family name. The cognomen Gacs is characteristic of Hungary, where it is quite a rare surname, France, where it is a very rare surname, and Germany. In absolute terms, it is the most numerous in Hungary, France, and the United States. Very seldom, Gacs is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gacs | Germany, Hungary, United States, India, France |
| gacs emilián béla Hungarian benedictines priest (1912-1988), HU (b. 1912) |
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| gacs gábor Hungarian illustrator, HU (b. 1930) |
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| peter gacs Hungarian-American mathematician and computer scientist (b. 1947) |
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| andras gacs (b. 1948) |
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| jános forgách de gacs - 1465 |
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| zsófia forgách de ghymes et gacs 1568 - 1588 |
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Mr, Elana, Edina, Erika, Sophie, Sylvie, Aloyse, Andrea, Attila, Bailey, Kalman, Robert, Roland, Gergő, Gábor, Laszlo, Tamás, Eszter, Valery, Ferenc, Imrene, Zoltan, Tibor, Marilyn, Timon, Tanya, Ms, Ken, Lou, Ute, Mhly, Anna, Adam, Kris, John, Jess, Juli, Soula, Aaron, Casey, Peter, David, Gabor, Gergo, Lilla, Louis, Julia, Tamas, and Melinda