Maddilyn is a distinctive girls' name in United States, ranking #7412 in 2000 with 14 recorded births. The name reached its all-time peak in 2016 with 101 births ranking #1981. Since 1996, the popularity has increased by 133.3%. In 2000, approximately 1 in every 129,712 girls born was named Maddilyn. FALLING Recent data shows the name is currently falling.