Allegra is a distinctive girls' name in United States, ranking #3893 in 2002 with 33 recorded births. The name reached its all-time peak in 1997 with 152 births ranking #1193. Since 1996, the popularity has decreased by 74.4%. In 2002, approximately 1 in every 54,449 girls born was named Allegra. FALLING Recent data shows the name is currently falling.