Dillian is a distinctive boys' name in United States, ranking #5053 in 2007 with 18 recorded births. The name reached its all-time peak in 1997 with 37 births ranking #2272. Since 1996, the popularity has decreased by 47.1%. In 2007, approximately 1 in every 115,291 boys born was named Dillian. FALLING Recent data shows the name is currently falling.