Last name Kelny (Kelny 
) , throughout the world, is an extremely rare cognomen. The surname Kelny is habitual in Latin America and the Caribbean, particularly Argentina, where it is an extremely rare surname, and Mexico. Much more frequently, Kelny is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kelny | Brazil, Mexico, United States, Peru, Democratic Republic of the Congo |