Cognomen 相田 (相田 
) , all around the world, is a rare last name. The family name 相田 is habitual in Eastern Asia, particularly China, where it is a very rare surname. More frequently, 相田 is the forename as well as the last name.
| 相田二郎 Japanese historian (1897-1945), JP (b. 1897) |
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| 相田重夫 Japanese historian, JP (b. 1917) |
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| 相田武文 Japanese architect, JP (b. 1937) |
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| 相田早智子 Japanese mangaka, JP |
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| 相田すみれ Japanese AV idol, JP (b. 1985) |
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| 相田あすか Japanese voice actress, JP (b. 1996) |
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