Cognomen Dlouhý (Dlouhy 
, Dlouhý 
, دلوهي) , around the world, is quite a common last name. The family name Dlouhý is habitual in Czechia, where it is quite a common surname, Slovakia, where it is quite a rare surname, and Austria. Measured by absolute frequency, the name is most common in Czechia, the United States, and Germany.
| VARIANT | COUNTRY |
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| Dlouhy | Austria, Germany, Czechia, United States, Slovakia |
| Dlouhý | Czechia, Germany, United States, Spain |
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františek dlouhý Czech entomologist, CZ (b. 1852) |
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| jan dlouhý CZ (b. 1808) |
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jaroslav dlouhý Czech religion writer and roman catholic priest (1869-1929), CZ (b. 1869) |
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| václav dlouhý učitel, hra pro děti, literatura o Budči., CZ (b. 1844) |
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| františek dlouhý attorney and public figure in Budweis, Czechia (1852-1925), CZ (b. 1852) |
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| jiří václav dlouhý CZ (b. 1844) |
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| josef dlouhý CZ (b. 1860) |
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| františek dlouhý CZ (b. 1869) |
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jaromír dlouhý Czech composer, CZ (b. 1929) |
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bedřich dlouhý Czech painter, CZ (b. 1932) |
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| jaroslav dlouhý CZ (b. 1877) |
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| františek dlouhý Czechoslovak member of Czechoslovak national parliament, legioneer, Czechoslovak politician and regional politician, CZ (b. 1889) |
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| vincenc dlouhý CZ (b. 1883) |
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| tomáš dlouhý CZ (b. 1887) |
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| jaromír dlouhý Czech politician, internist and neurologist, CZ (b. 1897) |
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Dan, Josef, Jenda, Jirka, Honza, Hynek, Vojta, Filip, Ondra, Martin, Marcel, Matouš, Matúš, Matěj, Miloš, Michal, Standa, Bohdan, Patrik, Péťa, Páťa, Robert, Jakub, Jarek, Libor, David, Jan, Ivo, Adam, Kuba, Petr, Pepa, Ivan, Marek, Milan, Mirek, Rudolf, Mára, Aleš, Karel, Kamil, Pavel, Radim, Radek, Roman, Robin, Denis, Danny, Míra, and Daniel