Dillan is a distinctive boys' name in United States, ranking #693 in 2001 with 260 recorded births. The name reached its all-time peak in 1998 with 312 births ranking #597. Since 1996, the popularity has increased by 10.2%. In 2001, approximately 1 in every 7,472 boys born was named Dillan. FALLING Recent data shows the name is currently falling.