Last name Factor (Factor 
, Faktor 
, Fator 
) , worldwide, is a common family name. The surname Factor is habitual in Reunion, where it is quite a common surname, Philippines, where it is quite a rare surname, and Slovakia. In absolute terms, it is commonest in Philippines, the United States, and Mexico. Very seldom, Factor is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Factor | Mexico, Spain, United States, Peru, Philippines |
| Faktor | Spain, Czechia, United States, Slovakia, Israel |
| Fator | Brazil, Indonesia, Czechia, United States, Philippines |
| Fetor | Nigeria, Spain, United States, India, France |
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nicolau factor Spanish artist (1520-1583), ES (b. 1520) |
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max factor American businessman, US (b. 1904) |
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| samuel factor Polish-American chess player, US (b. 1883) |
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| samuel factor Canadian politician, CA (b. 1892) |
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| john factor American mobster, US (b. 1892) |
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mallory factor American professor at The Citadel, US (b. 1950) |
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| stephen m. factor (b. 1942) |
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| ralph lance factor (b. 1944) |
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| rachel factor American actress, US (b. 1968) |
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| oficial factor Mexican professional wrestler, MX (b. 1977) |
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| stephanie factor infectious Disease Specialist |
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| x factor musician, member of the band Vigil |
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| s factor researcher |
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| stephanie h factor researcher ORCID ID = 0000-0003-0125-8639 |
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| yoav factor film producer |
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