Monroe is a Scottish surname that is usually traced to the mouth of the River Roe in Ireland, so it means "mouth of the Roe", the home of the clan's ancestors. President James Monroe gave it a place in American history, but it is Marilyn Monroe who made it glamorous enough for girls. Monroe entered the US top 1000 for girls in 2012 and reaches number 467 in 2025, its best rank so far.