Last name Sein (Sein 
, Сеин 
, セイン) , across the world, is a common surname. The cognomen Sein is characteristic of Myanmar, where it is a common surname, Mongolia, where it is quite a common surname, and Estonia. In absolute terms, it is commonest in Myanmar, Malaysia, and Mongolia. Also, Sein is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sein | Myanmar, South Korea, Indonesia, Mongolia, Malaysia |
| Сеин | Kazakhstan, Russia, Ukraine |
| Сейн | Russia, Ukraine |
Musai, Sai', Sain, Se-In, Seigne, Seinen, Seiner, Seinn, Seiñ, Seiń, Senn, Seyn, Seín, Seîn, Si, Sien, Signe, Siin, Sin, Soi, Soin, Sooth, Suus, Sèin, Sèiñ, Sèìñ, Séin, Séiñ, Sêiñ, Sêìñ, Sêîñ, Sêîń, Sêïñ, Sëiñ, Sëîń, Sëïn, Sëïñ, Sëīń, Sėīń, Sęiñ, Sęìn, Sęîñ, Sīn, Zain, Śèiñ, Śéiń, Ŝein, Ŝeiñ, Ŝeiń, Ŝeìn, Ŝeîn, Ŝeïñ, Ŝeįñ, Ŝèiñ, Ŝéin, Ŝéiñ, Ŝëiñ, Ŝęiñ, Šein, Šeiñ, Šêin, Šëiñ, Сеін, סיין, سين, เซิน, เซิ่น, เซิ้น, เสิน, เสิ่น, เส่ง, សីន, and 세인
| heberto sein Mexican activist and diplomat, MX (b. 1898) |
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| thiri pyanchi min sein b.26 December 1898 d.1 November 1978 (b. 1898) |
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| edgar sein Estonian journalist, EE (b. 1908) |
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| oskar sein (b. 1903) |
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| kenneth sein Burmese dancer and singer (1916-1973) (b. 1916) |
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sein ruffedge Malaysian film director, MY (b. 1983) |
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| emmanuel sein FR (b. 1928) |
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| henno-allan sein EE (b. 1932) |
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| corina victoria sein (b. 1936) |
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| valerij mikalaevic sein (b. 1937) |
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| sein stine Burmese musician (b. 1949) |
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| nyi sein Burmese politician, MM (b. 1964) |
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| eneritz sein Spanish athletics competitor, ES (b. 1979) |
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| sein anand j researcher |
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| sein htwa Burmese politician |
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