Dillian is a distinctive boys' name in United States, ranking #3450 in 2000 with 24 recorded births. The name reached its all-time peak in 1997 with 37 births ranking #2272. Since 1996, the popularity has decreased by 29.4%. In 2000, approximately 1 in every 81,831 boys born was named Dillian. FALLING Recent data shows the name is currently falling.