Dillan is a distinctive boys' name in United States, ranking #597 in 1998 with 312 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 32.2%. In 1998, approximately 1 in every 6,126 boys born was named Dillan. FALLING Recent data shows the name is currently falling.