Marylou is a distinctive girls' name in United States, ranking #9514 in 2012 with 12 recorded births. The name reached its all-time peak in 1996 with 38 births ranking #3125. Since 1996, the popularity has decreased by 68.4%. In 2012, approximately 1 in every 146,729 girls born was named Marylou. RISING Recent data shows the name is currently rising.