Family name Plachy (Plachy 
) , all around the world, is quite a rare last name. The cognomen Plachy is habitual in Czechia, where it is quite a common surname, Slovakia, and Austria, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in Czechia, Slovakia, and the United States. Much less frequently, Plachy is the forename as well as the last name.
| georg plachy (1606-1664) (b. 1606) |
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| andreas plachy (1755-1810) (b. 1755) |
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sylvia plachy American photographer, US (b. 1943) |
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| erwin franz plachy (b. 1904) |
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plachy ferenc Hungarian painter, HU |
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| mátyás plachy (1930–1993) Hungarian boxer, HU (b. 1930) |
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| june wilder plachy Ed.D. Oklahoma State University 1969 |
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| jan plachy CZ (b. 1972) |
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