Allegra is a distinctive girls' name in United States, ranking #3210 in 2005 with 48 recorded births. The name reached its all-time peak in 1997 with 152 births ranking #1193. Since 1996, the popularity has decreased by 62.8%. In 2005, approximately 1 in every 38,494 girls born was named Allegra. FALLING Recent data shows the name is currently falling.