Allegra is a distinctive girls' name in United States, ranking #3004 in 2018 with 54 recorded births. The name reached its all-time peak in 1997 with 152 births ranking #1193. Since 1996, the popularity has decreased by 58.1%. In 2018, approximately 1 in every 31,489 girls born was named Allegra. FALLING Recent data shows the name is currently falling.