Last name Tyan (Tyan 
, Тян 
, Тиан ) , around the globe, is a common surname. The family name Tyan is habitual in Kazakhstan, where it is quite a common surname, Kyrgyzstan, where it is quite a rare surname, and Lebanon. Measured by absolute frequency, it is commonest in Russia, Kazakhstan, and Indonesia. Also, Tyan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Tyan | Uzbekistan, Russia, Malaysia, Indonesia, Lebanon |
| Тян | Kazakhstan, Uzbekistan, Russia, Kyrgyzstan, Ukraine |
| Тиан | Kazakhstan, Russia, Ukraine |
| Тянь | Kazakhstan, Russia, Kyrgyzstan, Armenia, Ukraine |
| émile tyan Lebanese Islamic jurist (b. 1901) |
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lubomir tyan (b. 1959) |
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| marina tyan researcher |
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| paul tyan researcher |
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| yu-chang tyan researcher (ORCID 0000-0003-4953-6423) |
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| tyan parker dominguez researcher |
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| kevin tyan researcher |
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| m. m. tyan Ph.D. Steklov Institute of Mathematics 1964 |
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| yu-chang tyan researcher (ORCID 0000-0002-1917-5893) |
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| andrew tyan researcher |
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| paul tyan composer |
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| leonid tyan researcher (ORCID 0000-0001-9734-7286) |
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| tyan yeh Ph.D. California Institute of Technology 1968 |
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| violetta tyan Ukrainian association football player, UA |
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