Cognomen 足立 (Adachi 
, 足立 , Адати) , across the world, is quite a rare last name. The surname 足立 is habitual in Bhutan, where it is quite a common surname, Equatorial Guinea, where it is quite a rare surname, and Hong Kong, where it is a rare surname. Not in comparison with a country's population, it is commonest in Japan, the United States, and Brazil. Likewise, 足立 is the forename as well as the last name.
| 足立巻一 Japanese novelist and poet, JP (b. 1913) |
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| 足立亘 Japanese baseball player, JP (b. 1968) |
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| 足立たかふみ Japanese mangaka, JP (b. 1972) |
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| 足立美奈子 Japanese composer, JP |
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| 足立友 Japanese seiyū, JP (b. 1980) |
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| 足立玲菜 Japanese actress, JP (b. 1987) |
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| 足立 理 actor, JP (b. 1987) |
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| 足立かりん Japanese idol, JP (b. 1989) |
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| 足立かなえ JP (b. 1984) |
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| 足立真美 japanese tennis player, JP (b. 1996) |
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| 足立雄介 Japanese child actor, JP (b. 1997) |
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