Cognomen Alencastro (Alencastro 
) , all around the world, is quite a rare surname. The family name Alencastro is characteristic of Latin America and the Caribbean, particularly Brazil, where it is a rare surname, Uruguay, and Argentina. In absolute terms, it most frequently occurs in Latin America and the Caribbean, particularly Brazil, Mexico, and Argentina. Much less frequently, Alencastro is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Alencastro | Mexico, Colombia, United States, Argentina, Brazil |
| adolpho de alencastro graça Brazilian military personnel (1856-1890), BR (b. 1856) |
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| luiz felipe de alencastro Brazilian historian, BR (b. 1946) |
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| djalmo moraes alencastro person identified in the Museu da Pessoa collection, BR (b. 1946) |
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| francisco de paula alencastro Brazilian politician, BR |
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| luiz felippe de alencastro researcher |
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| maria angélica brum alencastro researcher |
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| paulo r de alencastro researcher |
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| simone alencastro person identified in the Museu da Pessoa collection |
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| josé maria de alencastro Brazilian politician, BR |
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| lidiane cristina da silva alencastro researcher |
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| antônio pedro de alencastro Brazilian politician, BR |
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| alencastro carneiro da fontoura Brazilian politician, BR |
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| antônio adolfo de alencastro Brazilian politician, BR |
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| lionel de alencastro researcher |
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| luiz f. de alencastro |
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