Cognomen Mølby (Mølby 
) , throughout the world, is a very rare family name. The last name Mølby is characteristic of Northern Europe, particularly Denmark, where it is quite a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Mølby | Denmark |
|
jan mølby Danish footballer, DK (b. 1963) |
|
| johnny mølby Danish footballer, DK (b. 1969) |
|