Cognomen M-Jay (M-Jay 
) , in the world, is an extremely rare last name. The family name M-Jay is characteristic of Sub-Saharan Africa, particularly South Africa, where it is an extremely rare surname. More prevalently, M-Jay is the forename as well as the last name. Parts of the name also exists independently as a first name M, and a first name Jay.
| VARIANT | COUNTRY |
|---|---|
| M-Jay | Philippines, South Africa |