Family name Laín (ライン 
, Laín 
) , across the world, is a very rare surname. The family name Laín is characteristic of Uruguay, where it is a rare surname, and Spain. More frequently, Laín is the forename as well as the last name.
| laín fernández (b. 950) |
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pedro laín entralgo medical researcher (1908-2001), ES (b. 1908) |
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| josé laín entralgo ES (b. 1910) |
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| domingo laín (b. 1940) |
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| pedro alemán laín (b. 1964) |
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| ana laín researcher (ORCID 0000-0001-7069-9126) |
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Ana, Paloma, Rocío, Gloria, Lucía, Jesús, Elvira, Isabel, Iñigo, Ángel, Mónika, Alberto, Alfredo, Antonio, Arantxa, Beatriz, Ricardo, Vanessa, Ángela, Macarena, Cristina, Patricia, Blanca, Carmen, Carlos, Albert, Sara, Aure, Ruth, Luis, Jose, Juan, Maria, Mario, Marta, Mingo, Gabriela, Angel, David, Laura, Jaime, José, Nancy, Elena, María, Manuel, Miguel, Susana, Raúl, and Joaquín