Last name 一也 (一也 
) , in all the world, is a very rare surname. The surname 一也 is habitual in Eastern Asia, particularly China, where it is an extremely rare surname. More prevalently, 一也 is the forename as well as the last name.
| 小栗 一也 Japanese actor, JP (b. 1923) |
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| 青山 一也 Japanese actor, JP (b. 1951) |
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