Cognomen Kogiku (Kogiku 
) , in the world, is a rare last name. The last name Kogiku is habitual in Japan, where it is a rare surname, Venezuela, where it is an extremely rare surname, and the United States. More prevalently, Kogiku is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kogiku | Japan, United States, Brazil, Venezuela |
| ai kogiku researcher |
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| kiichirō chris kogiku Ph.D. University of Wisconsin-Madison 1959 |
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