Dillan is a distinctive boys' name in United States, ranking #688 in 1996 with 236 recorded births. This places Dillan in the top 7% of ranked US boys' names for the year. Its actual usage is classified as Uncommon. The name reached its all-time peak in 1998 with 312 births ranking #597. In 1996, approximately 1 in every 8,026 boys born was named Dillan. FALLING Recent data shows the name is currently falling.