Allegra is a distinctive girls' name in United States, ranking #3662 in 2003 with 38 recorded births. The name reached its all-time peak in 1997 with 152 births ranking #1193. Since 1996, the popularity has decreased by 70.5%. In 2003, approximately 1 in every 48,080 girls born was named Allegra. FALLING Recent data shows the name is currently falling.