Ilsa is a distinctive girls' name in United States, ranking #5098 in 1999 with 21 recorded births. The name reached its all-time peak in 2011 with 34 births ranking #4288. Since 1996, the popularity has increased by 10.5%. In 1999, approximately 1 in every 84,466 girls born was named Ilsa. RISING Recent data shows the name is currently rising.