Surname Kosuga (コスガ 
, Kosuga 
) , all around the world, is a very rare family name. The surname Kosuga is characteristic of Germany, where it is an extremely rare surname, Thailand, and the United States. Not in comparison with a country's population, it is the most numerous in the United States, Nigeria, and Brazil. Much more frequently, Kosuga is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| コスガ | Japan |
| Kosuga | Nigeria, Japan, China, United States, Brazil |
| vincent kosuga Onion farmer and commodity trader best known for manipulating the onion futures market, US (b. 1915) |
|
|
| asako kosuga researcher |
|
|
| toshiyuki kosuga researcher |
|