Marni is a distinctive girls' name in England & Wales, ranking #910 in 2022 with 38 recorded births. The name reached its all-time peak in 2014 with 48 births ranking #802. Since 1996, the popularity has increased by 533.3%. In 2022, approximately 1 in every 6,935 girls born was named Marni. FALLING Recent data shows the name is currently falling.