Cognomen 小川 (小川 
, Ogawa 
, Одзава 
) , all around the world, is a common surname. The cognomen 小川 is habitual in Singapore, where it is quite a rare surname, Japan, and Hong Kong. Not in comparison with a country's population, it is the most numerous in China, Japan, and Brazil. More frequently, 小川 is the forename as well as the last name.
| 小川文雄 Japanese billiards player, JP (b. 1800) |
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小川正太郎 Japanese baseball player, JP (b. 1910) |
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| 小川三男 Japanese politician, JP (b. 1902) |
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小川一夫 Japanese baseball player, JP (b. 1954) |
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| 小川太郎 Japanese prison official and researcher, JP (b. 1904) |
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| 小川太郎 Japanese pedagogue, JP (b. 1907) |
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| 小川重夫 Japanese entrepreneur, JP (b. 1917) |
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小川直也 Japanese judoka, JP (b. 1968) |
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小川大介 Japanese educator, JP (b. 1973) |
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| 小川アンナ JP (b. 1919) |
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| 小川健太郎 Japanese baseball player, JP (b. 1934) |
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| 小川陽一 Japanese teacher, JP (b. 1934) |
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| 小川京子 Japanese pianist, JP (b. 1934) |
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| 小川悦子 Japanese editor, JP (b. 1935) |
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| 小川和彦 Japanese teacher, JP (b. 1936) |
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