Marilou is a distinctive girls' name in United States, ranking #12337 in 2004 with 8 recorded births. The name reached its all-time peak in 1996 with 14 births ranking #6607. Since 1996, the popularity has decreased by 42.9%. In 2004, approximately 1 in every 229,515 girls born was named Marilou. RISING Recent data shows the name is currently rising.