Cognomen Casto (Casto 
, Casta 
, Kasta ) , around the world, is a common last name. The last name Casto is habitual in Nicaragua, where it is quite a rare surname, Honduras, and Spain. In absolute terms, the name is most common in the United States, Spain, and Mexico. Likewise, Casto is the forename as well as the last name.
| casto innocente ansaldi Italian professor/theologian/archaeologist., IT (b. 1710) |
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casto méndez núñez Spanish admiral, ES (b. 1824) |
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| casto josé cáceres (b. 1784) |
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casto plasencia Spanish painter (1846-1890), ES (b. 1846) |
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casto sampedro folgar ES (b. 1848) |
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| martha curnutt casto American murderer (b. 1812) |
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casto blanco cabeza Spanish pedagogue, ES (b. 1869) |
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| casto josé alvarado Honduran politician (1820-1873), HN (b. 1820) |
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casto maría del rivero Spanish archaeologist, ES (b. 1873) |
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| casto arguedas (b. 1820) |
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| casto olano irizar ES (b. 1834) |
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casto fernández-shaw Spanish architect, ES (b. 1896) |
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casto m. insua ES (b. 1888) |
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| casto de elera Spanish Dominican friar and scientist, ES (b. 1852) |
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casto inza ES (b. 1894) |
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