Dillyn is a distinctive boys' name in United States, ranking #3300 in 1999 with 24 recorded births. This places Dillyn in the top 28% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 1999 with 24 births ranking #3300. Since 1996, the popularity has increased by 140.0%. In 1999, approximately 1 in every 80,004 boys born was named Dillyn. FALLING Recent data shows the name is currently falling.