Surname Gainor (Gainor 
) , in all the world, is quite a rare family name. The family name Gainor is characteristic of Israel, where it is quite a rare surname, Honduras, where it is a rare surname, and the United States. Not in comparison with a country's population, the name is most common in the United States, Israel, and Canada. Much less frequently, Gainor is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gainor | Brazil, Honduras, United States, Canada, Israel |
| dutch gainor Canadian ice hockey player (1904-1962), CA (b. 1904) |
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| martin gainor Canadian football player, US (b. 1915) |
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| charlie gainor American-football player (1916-1996), US (b. 1916) |
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| chris gainor Canadian historian, CA (b. 1954) |
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| justin f gainor researcher |
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| gainor john (1629-1678) |
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| sapphire gainor Danish actress (b. 1985) |
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| gainor jones |
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