Family name Lain (Lain 
, 莱恩 
, レイン 
) , in all the world, is a common last name. The last name Lain is characteristic of Myanmar, where it is quite a rare surname, Uruguay, and Malaysia. Not in comparison with a country's population, it most frequently occurs in Myanmar, the United States, and Malaysia. Very seldom, Lain is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Lain | Myanmar, Italy, United States, Indonesia, Malaysia |
| 莱恩 | China |
| レイン | Japan |
| لاين | Iraq, Egypt, Sudan, Syria, Saudi Arabia |
| antonín lain CZ (b. 1895) |
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douglas lain American writer, US (b. 1970) |
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chasey lain American pornographic actress, US (b. 1971) |
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kellan lain Canadian ice hockey player, CA (b. 1989) |
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| jiří lain CZ (b. 1945) |
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| lain lawrence A Canadian Book Writer., CA (b. 1955) |
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| chip lain American racing driver (b. 1958) |
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| dominique lain French politician, FR (b. 1965) |
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| tracey lain Porn actress, DE (b. 1978) |
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| luis lain researcher |
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| antonio lain Ph.D. University of Illinois at Urbana-Champaign 1996 |
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| maria grazia lain researcher (ORCID 0000-0002-4748-2794) |
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| francisco villellas lain Spanish politician, ES |
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| santiago lain researcher |
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| sonia lain researcher |
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