Last name Regan (Regan 
, 里根 
, Реган 
, and others...) , in the entire world, is a common cognomen. The cognomen Regan is habitual in Ireland, where it is quite a common surname, Fiji, and Isle of Man (explore the name in all countries). Measured by absolute frequency, the name is most common in the United States, the United Kingdom, and Ireland. Also, Regan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Regan | United Kingdom, Philippines, Ireland, United States, Tanzania |
| 里根 | China |
| Реган, Риган | Kyrgyzstan, Kazakhstan, Ukraine, Russia |
| ريغان | Iraq |
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john warren regan politician in Massachusetts, US (b. 1833), US (b. 1833) |
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frank s. regan American businessman, US (b. 1862) |
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| john regan 1818-1893 , newspaper editor and author (b. 1818) |
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bill regan English footballer (1873-1934), GB (b. 1873) |
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charles tate regan British zoologist (1878–1943), GB (b. 1878) |
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patrick regan United States Army Medal of Honor recipient (1882-1943), US (b. 1882) |
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mike regan American baseball player, US (b. 1887) |
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| charles regan English cricketer (1842-1921), GB (b. 1842) |
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kenneth m. regan American politician (1893-1959), US (b. 1893) |
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| matthias j. regan Wisconsin politician, US (b. 1848) |
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| patrick regan United States Navy Medal of Honor recipient, IE (b. 1852) |
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| timothy regan (b. 1843) |
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| james thomas hammill regan Canadian politician, CA (b. 1855) |
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phil regan American actor (1906-1996), US (b. 1906) |
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| john e. regan American politician, US (b. 1857) |
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