Family name Thien (Thien 
, Thiên 
, Тхиен 
) , worldwide, is a common surname. The surname Thien is characteristic of South-eastern Asia, particularly Brunei, where it is quite a common surname, Malaysia, and Vietnam. In absolute terms, it is the most numerous in Vietnam, Malaysia, and Germany. Likewise, Thien is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Thien | Germany, Indonesia, Vietnam, Malaysia, United States |
| Thiên | Japan, Vietnam, Myanmar, United States, France |
| Тхиен | Russia, Belarus |
| ティエン | Japan |
| amalie thien (born 1836) (b. 1836) |
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| anton thien German politician (1900-1987), DE (b. 1900) |
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| hendrik thien Dutch Esperantist, NL (b. 1911) |
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andreas von thien German television presenter and journalist, DE (b. 1967) |
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madeleine thien Canadian writer, CA (b. 1974) |
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| carl r. thien (b. 1918) |
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| leonard b. thien American botanist, US (b. 1938) |
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| michel thien French politician, FR (b. 1942) |
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| thien vo-dai professor at the computer science department of Laval University, VN (b. 1945) |
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| manfred von thien German journalist, DE (b. 1955) |
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| hans-günter thien (b. 1947) |
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| ulrich thien (b. 1950) |
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| thien nguyen American soccer player, US (b. 1969) |
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| jérémy thien French politician, FR (b. 1971) |
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| margot thien American synchronized swimmer, US (b. 1971) |
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