Dilan is a name of Turkish origin and it means "valley" in Turkish language. It is also associated with the name Dilara, which means "like a river flowing through the valley". The name Dilan is believed to have been popularized by the novel "Muhsin Bey" written by Reşat Nuri Güntekin, where the main character's wife was named Dilara and her brother was named Dilan. Although it is not very common worldwide, the name Dilan has gained popularity in recent years, especially among Turkish-speaking communities. It is considered to be a unisex name but it is more commonly used for boys.
The name Dilan appears to have seen some popularity fluctuations over the years, with peaks in 2003 and 2013, and a noticeable decline since 2018.