Allegra is a distinctive girls' name in United States, ranking #2029 in 2009 with 101 recorded births. The name reached its all-time peak in 1997 with 152 births ranking #1193. Since 1996, the popularity has decreased by 21.7%. In 2009, approximately 1 in every 18,187 girls born was named Allegra. FALLING Recent data shows the name is currently falling.