Family name Kay-Martin (Kay-Martin 
) , throughout the world, is an extremely rare cognomen. The surname Kay-Martin is characteristic of Northern America, particularly the United States, where it is an extremely rare surname. More frequently, Kay-Martin is the forename as well as the last name. Parts of the name also exists independently as a first name Kay, and a first name Martin.
| VARIANT | COUNTRY |
|---|---|
| Kay-Martin | United States, Norway |