Marni is a distinctive girls' name in England & Wales, ranking #882 in 2013 with 42 recorded births. The name reached its all-time peak in 2014 with 48 births ranking #802. Since 1996, the popularity has increased by 600.0%. In 2013, approximately 1 in every 7,344 girls born was named Marni. FALLING Recent data shows the name is currently falling.