Family name Kosuge (Kosuge 
) , throughout the world, is a rare cognomen. The cognomen Kosuge is habitual in Finland, where it is a rare surname, New Zealand, and Japan, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Japan, the United States, and Brazil. Likewise, Kosuge is the forename as well as the last name.
| tsune kosuge born:1925|died:1988|; Kosuge, Tsune, 1925-....; Kosuge, Tsune 1925-1988 (b. 1925) |
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| yasuko kosuge Japanese windsurfer, JP (b. 1974) |
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| makoto kosuge researcher |
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| keiko kosuge botanist |
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| tomoo kosuge researcher |
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