Allegra is a distinctive girls' name in United States, ranking #1769 in 2010 with 116 recorded births. The name reached its all-time peak in 1997 with 152 births ranking #1193. Since 1996, the popularity has decreased by 10.1%. In 2010, approximately 1 in every 15,322 girls born was named Allegra. FALLING Recent data shows the name is currently falling.