Allegra is a distinctive girls' name in United States, ranking #2937 in 2012 with 58 recorded births. The name reached its all-time peak in 1997 with 152 births ranking #1193. Since 1996, the popularity has decreased by 55.0%. In 2012, approximately 1 in every 30,358 girls born was named Allegra. FALLING Recent data shows the name is currently falling.