Allegra is a distinctive girls' name in United States, ranking #2845 in 2001 with 51 recorded births. The name reached its all-time peak in 1997 with 152 births ranking #1193. Since 1996, the popularity has decreased by 60.5%. In 2001, approximately 1 in every 35,305 girls born was named Allegra. FALLING Recent data shows the name is currently falling.