Monroy is a surname of Spanish origin.
This habitational name derived from Monroy, meaning "red mountain". A place in the Province of Cáceres, Spain.[1][2]
The Monroe variant has the letter e at the end instead of y, which is a different surname.
Spanish: habitational name from Monroy ('red mountain') a place in Cáceres province.
Spanish: habitational name from Monroy ('red mountain') a place in Cáceres province.