Around the world, Ken'Ichi (健一 
, ケンイチ 
, 谷川 ) is quite a rare mostly male, but uncommonly girly forename. The first name Ken'Ichi is characteristic of Eastern Asia, particularly Japan, where it is a rare male name, and China, where it is a rare largely boy's, but infrequently girly name. More prevalently, Ken'Ichi is the last name as well as the forename.
| kawaura ken'ichi ( 1868-1957) (b. 1868) |
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| ken'ichi ishimoto Japanese candidate (b. 1947) |
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| ken'ichi sugihara (b. 1938) |
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| ken'ichi iwaki (b. 1944) |
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| ken'ichi akitake (b. 1947) |
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| ken'ichi kanatani (b. 1947) |
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| ken'ichi yoshida (b. 1953) |
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| ken'ichi ohshika mathematician |
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| ken'ichi kuga Ph.D. University of Texas at Austin 1984 |
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| ken'ichi saiki botanist |
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| ken'ichi koyanagi researcher |
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| ken'ichi matsumoto researcher (ORCID 0000-0002-9349-9765) |
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| ken'ichi furuya researcher |
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| ken'ichi oguri director and filmmaker |
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| ken'ichi yoshida palaeontologist |
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