Ilsa is a distinctive girls' name in United States, ranking #6947 in 2005 with 17 recorded births. This places Ilsa in the top 36% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2011 with 34 births ranking #4288. Since 1996, the popularity has decreased by 10.5%. In 2005, approximately 1 in every 108,688 girls born was named Ilsa. RISING Recent data shows the name is currently rising.