Marlo has been given to about 10,944 people in the United States since 1880. It was most common in 1970, which makes it a boomer-era name.
Its best year was 1970, when 635 babies were given the name, ranking 398th. The typical living American called Marlo is about 48 years old today. It is relatively most common in Louisiana, where it accounts for 0.01% of births.
Source: US Social Security Administration, national and state name files, 2025 release, and the Office for National Statistics for England and Wales. Etymology researched and written by our editors. Living-population and median-age figures are our own estimates, described in the methodology.