Dillan is a distinctive boys' name in United States, ranking #1329 in 2013 with 129 recorded births. The name reached its all-time peak in 1998 with 312 births ranking #597. Since 1996, the popularity has decreased by 45.3%. In 2013, approximately 1 in every 14,661 boys born was named Dillan. FALLING Recent data shows the name is currently falling.