Dillian is a distinctive boys' name in United States, ranking #5626 in 2009 with 16 recorded births. The name reached its all-time peak in 1997 with 37 births ranking #2272. Since 1996, the popularity has decreased by 52.9%. In 2009, approximately 1 in every 123,957 boys born was named Dillian. FALLING Recent data shows the name is currently falling.