Marylou is a distinctive girls' name in United States, ranking #4400 in 2001 with 28 recorded births. The name reached its all-time peak in 1996 with 38 births ranking #3125. Since 1996, the popularity has decreased by 26.3%. In 2001, approximately 1 in every 64,306 girls born was named Marylou. RISING Recent data shows the name is currently rising.