Dillan is a distinctive boys' name in United States, ranking #1258 in 2014 with 142 recorded births. The name reached its all-time peak in 1998 with 312 births ranking #597. Since 1996, the popularity has decreased by 39.8%. In 2014, approximately 1 in every 13,524 boys born was named Dillan. FALLING Recent data shows the name is currently falling.