Allegra is a distinctive girls' name in United States, ranking #2239 in 2000 with 70 recorded births. The name reached its all-time peak in 1997 with 152 births ranking #1193. Since 1996, the popularity has decreased by 45.7%. In 2000, approximately 1 in every 25,942 girls born was named Allegra. FALLING Recent data shows the name is currently falling.