Allegra is a distinctive girls' name in England & Wales, ranking #1317 in 2002 with 15 recorded births. The name reached its all-time peak in 2018 with 63 births ranking #641. Since 1996, the popularity has increased by 66.7%. In 2002, approximately 1 in every 17,824 girls born was named Allegra. STABLE Recent data shows the name is currently stable.