Ilsa is a distinctive girls' name in United States, ranking #5434 in 2001 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 2001, approximately 1 in every 85,741 girls born was named Ilsa. RISING Recent data shows the name is currently rising.