Allegra is a distinctive girls' name in England & Wales, ranking #747 in 2025 with 49 recorded births. The name reached its all-time peak in 2018 with 63 births ranking #641. Since 1996, the popularity has increased by 444.4%. In 2025, approximately 1 in every 5,169 girls born was named Allegra. STABLE Recent data shows the name is currently stable.