Last name Casamayor (Casamayor 
) , in the world, is quite a common surname. The last name Casamayor is habitual in Cuba, where it is quite a rare surname, Peru, and Philippines. Measured by absolute frequency, this name is the most popular in Philippines, Peru, and Argentina. Much less frequently, Casamayor is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Casamayor | Spain, Philippines, Argentina, Peru, Venezuela |
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maría andresa casamayor Spanish mathematician and teacher, ES (b. 1720) |
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jorge ibor y casamayor ES (b. 1755) |
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| faustino casamayor ES (b. 1760) |
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| prudencio casamayor FR (b. 1763) |
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| josé ramón de aizpurúa y casamayor ES (b. 1769) |
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| francisco fors de casamayor (b. 1809) |
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| francesc fors i de casamayor ES (b. 1809) |
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| federico casamayor Spanish politician (1873-1954), ES (b. 1873) |
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josé casamayor Argentinian actor, AR |
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| francisco casamayor Cuban weightlifter (b. 1949) |
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| pierre casamayor FR (b. 1943) |
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| lola casamayor Spanish actor, ES (b. 1958) |
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| monique casamayor French politician, FR (b. 1962) |
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| gregorio casamayor (b. 1955) |
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| joel casamayor boxer, CU (b. 1971) |
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