Surname Klien (Klien 
, 克莱恩 
, Cliënt) , all over the world, is quite a rare family name. The last name Klien is habitual in Western Europe, particularly Liechtenstein, where it is quite a common surname, Austria, where it is quite a rare surname, and Switzerland, where it is a rare surname. In absolute terms, it is commonest in Austria, the United States, and Germany. Much less frequently, Klien is the forename as well as the last name.
| johann gottfried klien (b. 1739) |
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| karl klien German jurist and writer (1776-1839), DE (b. 1776) |
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| ernst klien Russian teacher, DE (b. 1794) |
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erika giovanna klien American artist (1900-1957), US (b. 1900) |
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| ewald richard klien DE (b. 1841) |
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wolfgang klien DE (b. 1907) |
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| heinrich klien (b. 1875) |
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| ernst klien (b. 1875) |
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| erich klien (b. 1881) |
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paula klien Brazilian photographer, BR (b. 1968) |
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| walter klien Austrian musician, AT (b. 1928) |
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| gilbert klien Austrian composer and conductor, AT (b. 1929) |
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peter klien AT (b. 1970) |
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| hermann klien Austrian gymnast, AT (b. 1932) |
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christian klien Austrian racing driver, AT (b. 1983) |
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