Marylou is a distinctive girls' name in United States, ranking #7453 in 2003 with 15 recorded births. The name reached its all-time peak in 1996 with 38 births ranking #3125. Since 1996, the popularity has decreased by 60.5%. In 2003, approximately 1 in every 121,803 girls born was named Marylou. RISING Recent data shows the name is currently rising.