Isobelle is a moderately popular girls' name in England & Wales, ranking #406 in 2014 with 106 recorded births. The name reached its all-time peak in 2009 with 181 births ranking #265. Since 1996, the popularity has increased by 140.9%. In 2014, approximately 1 in every 2,893 girls born was named Isobelle. FALLING Recent data shows the name is currently falling.