Dillyn is a distinctive girls' name in United States, ranking #9427 in 2004 with 11 recorded births. This places Dillyn in the bottom 50% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2013 with 19 births ranking #6542. In 2004, approximately 1 in every 166,920 girls born was named Dillyn. FALLING Recent data shows the name is currently falling.