Dillan is a distinctive boys' name in United States, ranking #612 in 1997 with 287 recorded births. This places Dillan in the top 6% 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 21.6%. In 1997, approximately 1 in every 6,568 boys born was named Dillan. FALLING Recent data shows the name is currently falling.