Allegra is a distinctive girls' name in United States, ranking #2509 in 2017 with 71 recorded births. The name reached its all-time peak in 1997 with 152 births ranking #1193. Since 1996, the popularity has decreased by 45.0%. In 2017, approximately 1 in every 24,308 girls born was named Allegra. FALLING Recent data shows the name is currently falling.