Family name Plachý (Plachý 
) , all around the world, is a rare cognomen. The family name Plachý is characteristic of Czechia, where it is quite a rare surname, Slovakia, and Germany, where it is an extremely rare surname.
| VARIANT | COUNTRY |
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| Plachý | Germany, United States, Czechia, Slovakia |
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jiří plachý CZ (b. 1606) |
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| šimon plachý z třebnice CZ (b. 1600) |
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| jiří františek plachý CZ (b. 1606) |
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| ondrej plachý Slovak publicist and writer, SK (b. 1755) |
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| antonín plachý (1760-1826), CZ (b. 1760) |
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jiří plachý starší Czech actor and director, CZ (b. 1899) |
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| ferdinand plachý Czechoslovak teacher, CZ (b. 1881) |
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jiří plachý mayor of Rožmitál pod Třemšínem (1971–1980), CZ (b. 1933) |
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| jakub plachý (b. 1888) |
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jozef plachý Czechoslovak runner and Olympic athlete, SK (b. 1949) |
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| františek plachý CZ (b. 1892) |
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| josef plachý CZ (b. 1893) |
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roman plachý Czech painter and teacher, CZ (b. 1958) |
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zdenek plachý Czech director, CZ (b. 1961) |
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| jiří plachý CZ (b. 1901) |
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Jan, Rudolf, Daniel, Dušan, Luboš, Julius, Jiří, Zdenek, Arnošt, Bohumil, Radekamajka, Lukáš, Lubomír, Tomáš, Václav, Ondřej, Zdeněk, Zbyněk, Miloslav, Miroslav, Antonín, Bohuslav, Robert, Patrik, Ctibor, Michal, Adam, Petr, Marek, Milan, Aleš, Karel, Pavel, Peter, Radim, Radek, Ladislav, Roman, Jakub, Josef, Jirka, Honza, Vojta, Filip, Ondra, Martin, Matěj, Miloš, David, and Jaroslav