Maddilyn is a distinctive girls' name in United States, ranking #12153 in 1999 with 7 recorded births. The name reached its all-time peak in 2016 with 101 births ranking #1981. Since 1996, the popularity has increased by 16.7%. In 1999, approximately 1 in every 253,397 girls born was named Maddilyn. FALLING Recent data shows the name is currently falling.