Dailen is a distinctive boys' name in United States, ranking #8339 in 1997 with 6 recorded births. This places Dailen in the bottom 23% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2007 with 25 births ranking #4031. In 1997, approximately 1 in every 314,182 boys born was named Dailen. FALLING Recent data shows the name is currently falling.