Family name 柏木 (Kashiwagi 
, 柏木 , Касиваги 
) , around the world, is a rare surname. The cognomen 柏木 is habitual in Singapore, where it is a rare surname, Japan, and Finland. Not in comparison with a country's population, the name is most common in Japan, the United States, and China. Also, 柏木 is the forename as well as the last name.
| 柏木雄介 (1917-2004), JP (b. 1917) |
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| 柏木繁男 Japanese psychologist, JP (b. 1930) |
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| 柏木惠子 Japanese psychologist, JP (b. 1932) |
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柏木 由紀 Japanese idol, actress, member of AKB48 (1991-), JP (b. 1991) |
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| 柏木浩一 Japanese architect, JP (b. 1946) |
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| 柏木哲夫 JP (b. 1939) |
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| 柏木宏之 JP (b. 1958) |
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| 柏木久美子 Japanese alpine skier, JP (b. 1978) |
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| 柏木義之 JP (b. 1975) |
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| 柏木 佑介 Japanese actor, JP (b. 1989) |
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| 柏木のぞみ Japanese AV idol, JP (b. 1993) |
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