From the surname Monroe.

Used as a feminine name too.

Meaning “mouth of the Roe”.

The Roe is a river in Ireland. ┬áThe origin of the name “Roe” is not clear. Sources mention a Viking origin and the Irish word “rua”, meaning “red”.

Famous male bearers are: Monroe Robertson, Monroe Salisbury, Monroe Owsley.

After Mariah Carey and Nick Cannon named their daughter Monroe, honoring Marilyn Monroe, the name made a comeback as a feminine name.