Dillan is a distinctive boys' name in United States, ranking #2508 in 2021 with 53 recorded births. The name reached its all-time peak in 1998 with 312 births ranking #597. Since 1996, the popularity has decreased by 77.5%. In 2021, approximately 1 in every 32,986 boys born was named Dillan. FALLING Recent data shows the name is currently falling.