Isobelle is a moderately popular girls' name in England & Wales, ranking #333 in 2006 with 130 recorded births. The name reached its all-time peak in 2009 with 181 births ranking #265. Since 1996, the popularity has increased by 195.5%. In 2006, approximately 1 in every 2,302 girls born was named Isobelle. FALLING Recent data shows the name is currently falling.