Last name Jelby (Jelby 
) , throughout the world, is a very rare family name. The surname Jelby is habitual in Denmark, where it is a very rare surname, Nicaragua, and Honduras. Measured by absolute frequency, it is the most numerous in Germany, Denmark, and Nicaragua. More prevalently, Jelby is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Jelby | Philippines, India, Honduras, Germany, Denmark |
| erik jelby badminton player, DE (b. 1949) |
|