Dillian is a distinctive boys' name in United States, ranking #4157 in 2004 with 21 recorded births. The name reached its all-time peak in 1997 with 37 births ranking #2272. Since 1996, the popularity has decreased by 38.2%. In 2004, approximately 1 in every 94,514 boys born was named Dillian. FALLING Recent data shows the name is currently falling.