Dillian is a distinctive boys' name in United States, ranking #3212 in 2003 with 29 recorded births. The name reached its all-time peak in 1997 with 37 births ranking #2272. Since 1996, the popularity has decreased by 14.7%. In 2003, approximately 1 in every 68,113 boys born was named Dillian. FALLING Recent data shows the name is currently falling.