Allegra is a distinctive girls' name in United States, ranking #1272 in 1998 with 142 recorded births. The name reached its all-time peak in 1997 with 152 births ranking #1193. Since 1996, the popularity has increased by 10.1%. In 1998, approximately 1 in every 12,443 girls born was named Allegra. FALLING Recent data shows the name is currently falling.