Dillan is a distinctive boys' name in United States, ranking #1943 in 2018 with 76 recorded births. The name reached its all-time peak in 1998 with 312 births ranking #597. Since 1996, the popularity has decreased by 67.8%. In 2018, approximately 1 in every 23,888 boys born was named Dillan. FALLING Recent data shows the name is currently falling.