Isobelle is a distinctive girls' name in England & Wales, ranking #562 in 1996 with 44 recorded births. This places Isobelle in the top 11% of ranked UK girls' names for the year. Its actual usage is classified as Uncommon. The name reached its all-time peak in 2009 with 181 births ranking #265. In 1996, approximately 1 in every 6,727 girls born was named Isobelle. FALLING Recent data shows the name is currently falling.