Surname Monby (Monby 
) , throughout the world, is a rare cognomen. The family name Monby is habitual in Denmark, where it is quite a rare surname, the United Kingdom, where it is an extremely rare surname, and the United States. Much less frequently, Monby is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Monby | Malaysia, India, United States, United Kingdom, Denmark |