Marilou is a distinctive girls' name in United States, ranking #17901 in 2016 with 5 recorded births. The name reached its all-time peak in 1996 with 14 births ranking #6607. Since 1996, the popularity has decreased by 64.3%. In 2016, approximately 1 in every 354,298 girls born was named Marilou. RISING Recent data shows the name is currently rising.