Dillian is a distinctive boys' name in United States, ranking #3118 in 1998 with 25 recorded births. The name reached its all-time peak in 1997 with 37 births ranking #2272. Since 1996, the popularity has decreased by 26.5%. In 1998, approximately 1 in every 76,453 boys born was named Dillian. FALLING Recent data shows the name is currently falling.