Marylou is a distinctive girls' name in United States, ranking #4280 in 2017 with 34 recorded births. The name reached its all-time peak in 1996 with 38 births ranking #3125. Since 1996, the popularity has decreased by 10.5%. In 2017, approximately 1 in every 50,761 girls born was named Marylou. RISING Recent data shows the name is currently rising.