Cognomen Kosumi (Kosumi 
) , globally, is quite a rare family name. The cognomen Kosumi is characteristic of Kosovo, where it is quite a common surname, Albania, and Serbia, where it is quite a rare surname. Measured by absolute frequency, it is commonest in Kosovo, Japan, and Albania. Likewise, Kosumi is the forename as well as the last name.
| toshirō kosumi baseball player (1921-2013) (b. 1921) |
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| bajram kosumi Kosovar politician, XK (b. 1960) |
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| hideyuki kosumi researcher |
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| keisuke kosumi researcher |
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| daisuke kosumi researcher |
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