Dillian is a distinctive boys' name in United States, ranking #6073 in 2014 with 14 recorded births. The name reached its all-time peak in 1997 with 37 births ranking #2272. Since 1996, the popularity has decreased by 58.8%. In 2014, approximately 1 in every 137,174 boys born was named Dillian. FALLING Recent data shows the name is currently falling.