Allegra is a distinctive girls' name in United States, ranking #2339 in 2015 with 79 recorded births. The name reached its all-time peak in 1997 with 152 births ranking #1193. Since 1996, the popularity has decreased by 38.8%. In 2015, approximately 1 in every 22,591 girls born was named Allegra. FALLING Recent data shows the name is currently falling.