Allegra is a distinctive girls' name in United States, ranking #4953 in 2004 with 26 recorded births. The name reached its all-time peak in 1997 with 152 births ranking #1193. Since 1996, the popularity has decreased by 79.8%. In 2004, approximately 1 in every 70,620 girls born was named Allegra. FALLING Recent data shows the name is currently falling.