Marylou is a distinctive girls' name in United States, ranking #4327 in 1998 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 1998, approximately 1 in every 67,957 girls born was named Marylou. RISING Recent data shows the name is currently rising.