Allegra is a distinctive girls' name in United States, ranking #3979 in 2025 with 36 recorded births. The name reached its all-time peak in 1997 with 152 births ranking #1193. Since 1996, the popularity has decreased by 72.1%. In 2025, approximately 1 in every 44,646 girls born was named Allegra. FALLING Recent data shows the name is currently falling.