Cognomen Alcain (Alcain 
) , across the world, is quite a rare last name. The last name Alcain is habitual in Uruguay, where it is quite a rare surname, Philippines, and Argentina, where it is a rare surname. In absolute terms, it is commonest in Philippines, Argentina, and Guatemala. Much less frequently, Alcain is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Alcain | Argentina, United States, Philippines, Guatemala, Uruguay |
| herminia de alcain (1826-1887), FR (b. 1826) |
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| philippe alcain (b. 1900) |
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| julieta alcain researcher |
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| francisco j alcain researcher ORCID ID = 0000-0002-6833-7940 |
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