Dillan is a distinctive boys' name in United States, ranking #667 in 2004 with 306 recorded births. This places Dillan in the top 5% of ranked US boys' names for the year. Its actual usage is classified as Uncommon. The name reached its all-time peak in 1998 with 312 births ranking #597. Since 1996, the popularity has increased by 29.7%. In 2004, approximately 1 in every 6,486 boys born was named Dillan. FALLING Recent data shows the name is currently falling.