Over the past 110 years, 19 247 girls have been named Margo. The name Margo ranks 912th in the United States among the most common names for girls. For the first time more than ten times newborns were named Margo in 1920. The peak of popularity of the name Margo came in the 1940s and 1950s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.