Dillian is a distinctive boys' name in United States, ranking #10955 in 2020 with 6 recorded births. The name reached its all-time peak in 1997 with 37 births ranking #2272. Since 1996, the popularity has decreased by 82.4%. In 2020, approximately 1 in every 287,511 boys born was named Dillian. FALLING Recent data shows the name is currently falling.