In the entire world, Mārcis (Marcis 
, Mārcis , Марцис 
) is a rare primarily masculine, but very seldom feminine first name. The given name Mārcis is characteristic of Latvia, where it is quite a common masculine name, Puerto Rico, where it is quite a rare boy's name, and Nicaragua, where it is a rare gender-neutral name. In absolute terms, it is the most numerous in Latvia, Puerto Rico, and Philippines. Likewise, Mārcis is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Marcis | Italy, Puerto Rico, Latvia, United States, Slovakia |
| Mārcis | Latvia, United States |
| Марцис | Ukraine, Russia |
| mārcis sārums LV (b. 1799) |
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mārcis auziņš Latvian physicist (1956-), LV (b. 1956) |
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mārcis ošs Latvian association football player, LV (b. 1991) |
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mārcis auziņš LV (b. 1983) |
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| mārcis cīrulis LV (b. 1946) |
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| mārcis leja Latvian physician, LV (b. 1964) |
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| mārcis štrobinders Latvian athletics competitor, LV (b. 1966) |
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| mārcis rullis Latvian bobsledder, LV (b. 1979) |
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| mārcis lācis actor (b. 1981) |
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| zembergs mārcis Latvian professional ice hockey forward (b. 1988) |
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| mārcis ērglis Latvian association football player, LV (b. 1992) |
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| mārcis vītols Latvian basketball player, LV (b. 1992) |
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| mārcis kalniņš Latvian cyclist, LV (b. 1998) |
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| mārcis šteinbergs Latvian basketball player, LV |
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