Family name Cosly (Cosly 
) , throughout the world, is an extremely rare cognomen. The cognomen Cosly is habitual in Honduras, where it is a very rare surname, Nicaragua, and Nigeria, where it is an extremely rare surname. Likewise, Cosly is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Cosly | Nigeria, United States, Nicaragua, Philippines, Honduras |