Cognomen Castor (Castor 
, Castory 
, Castoro 
) , worldwide, is a common last name. The cognomen Castor is characteristic of Philippines, where it is quite a common surname, Haiti, where it is quite a rare surname, and Tanzania. In absolute terms, this name is the most popular in Philippines, the United States, and Brazil. Much less frequently, Castor is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Castor | Mexico, Philippines, Brazil, United States, Tanzania |
| Castory | Germany, France, Philippines, United States, Tanzania |
| Castoro | Italy, France, Philippines, Brazil, United States |
| castor d'alexandrie (b. 250) |
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castor von karden Priest and hermit, DE (b. 400) |
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| castor d'apt Bishop of Apt, FR (b. 400) |
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| john george castor (b. 1710) |
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castor garcía fernández Spanish politician (1813-1891), ES (b. 1813) |
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george a. castor American politician, US (b. 1855) |
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castor elices ES (b. 1847) |
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castor sánchez martínez Spanish politician (1894-1936), ES (b. 1894) |
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| r. j. castor American politician – Minnesota -House 1937-38 (District 16), US (b. 1882) |
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| castor castro cancela Spanish politician, ES (b. 1886) |
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| brian castor English cricketer (1889-1979), GB (b. 1889) |
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jimmy castor American musician, US (b. 1940) |
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betty castor American politician, US (b. 1941) |
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suzy castor HT (b. 1936) |
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| robert josef castor (b. 1892) |
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