Allegra is a distinctive girls' name in England & Wales, ranking #706 in 2022 with 52 recorded births. The name reached its all-time peak in 2018 with 63 births ranking #641. Since 1996, the popularity has increased by 477.8%. In 2022, approximately 1 in every 5,068 girls born was named Allegra. STABLE Recent data shows the name is currently stable.