Marni is a distinctive girls' name in England & Wales, ranking #1044 in 2020 with 32 recorded births. The name reached its all-time peak in 2014 with 48 births ranking #802. Since 1996, the popularity has increased by 433.3%. In 2020, approximately 1 in every 8,388 girls born was named Marni. FALLING Recent data shows the name is currently falling.