Dillan is a distinctive boys' name in United States, ranking #793 in 2009 with 283 recorded births. The name reached its all-time peak in 1998 with 312 births ranking #597. Since 1996, the popularity has increased by 19.9%. In 2009, approximately 1 in every 7,008 boys born was named Dillan. FALLING Recent data shows the name is currently falling.