It is a word of Turkish origin meaning star. It is the name of a star in the constellation Ursa Minor. It is also known to astronomers as Vildiur, Gildun, Delta UMi, 23 UMi, Ursa Minor 23, HD 166205, HR 6789.
Yildun- refers to a star whose official name was approved on August 21, 2016, located in the constellation Ursa Minor-