Marylou is a distinctive girls' name in United States, ranking #4406 in 1999 with 26 recorded births. The name reached its all-time peak in 1996 with 38 births ranking #3125. Since 1996, the popularity has decreased by 31.6%. In 1999, approximately 1 in every 68,222 girls born was named Marylou. RISING Recent data shows the name is currently rising.