Surname 信一 (信一 
) , in the world, is a rare cognomen. The surname 信一 is characteristic of Eastern Asia, particularly China, where it is an extremely rare surname. More prevalently, 信一 is the forename as well as the last name.
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西田 信一 Japanese politician, JP (b. 1902) |
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| 小林 信一 (b. 1908) |
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| 神保 信一 Japanese psychologist (1930-2018), JP (b. 1930) |
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| 箱島 信一 Japanese journalist, JP (b. 1937) |
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