Isobelle is a distinctive girls' name in England & Wales, ranking #1584 in 2025 with 19 recorded births. The name reached its all-time peak in 2009 with 181 births ranking #265. Since 1996, the popularity has decreased by 56.8%. In 2025, approximately 1 in every 13,331 girls born was named Isobelle. FALLING Recent data shows the name is currently falling.