Allegra is a distinctive girls' name in United States, ranking #1719 in 1999 with 94 recorded births. The name reached its all-time peak in 1997 with 152 births ranking #1193. Since 1996, the popularity has decreased by 27.1%. In 1999, approximately 1 in every 18,870 girls born was named Allegra. FALLING Recent data shows the name is currently falling.