Allegra is a distinctive girls' name in United States, ranking #3493 in 2021 with 44 recorded births. The name reached its all-time peak in 1997 with 152 births ranking #1193. Since 1996, the popularity has decreased by 65.9%. In 2021, approximately 1 in every 37,266 girls born was named Allegra. FALLING Recent data shows the name is currently falling.