Dillian is a distinctive boys' name in United States, ranking #4091 in 2005 with 22 recorded births. The name reached its all-time peak in 1997 with 37 births ranking #2272. Since 1996, the popularity has decreased by 35.3%. In 2005, approximately 1 in every 90,779 boys born was named Dillian. FALLING Recent data shows the name is currently falling.