Marnie is a moderately popular girls' name in England & Wales, ranking #123 in 2022 with 420 recorded births. The name reached its all-time peak in 2024 with 428 births ranking #113. Since 1996, the popularity has increased by 924.4%. In 2022, approximately 1 in every 627 girls born was named Marnie. STABLE Recent data shows the name is currently stable.