Dillan is a distinctive boys' name in United States, ranking #1208 in 2012 with 148 recorded births. The name reached its all-time peak in 1998 with 312 births ranking #597. Since 1996, the popularity has decreased by 37.3%. In 2012, approximately 1 in every 12,815 boys born was named Dillan. FALLING Recent data shows the name is currently falling.