Dillian is a distinctive boys' name in United States, ranking #7638 in 2011 with 10 recorded births. This places Dillian in the bottom 47% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 1997 with 37 births ranking #2272. Since 1996, the popularity has decreased by 70.6%. In 2011, approximately 1 in every 189,899 boys born was named Dillian. FALLING Recent data shows the name is currently falling.