Yalçın
Yalçın is a Turkish-origin name used by many Muslim families in Turkic regions; it is not Arabic or Quranic but culturally acceptable among Muslims in Turkey and Central Asia.
Literally it means 'steep' or 'precipitous', used for cliffs, crags, or sheer heights in Turkish.
In Turkish pronunciation it is /jalˈtʃɯn/, romanized often as Yalchin or Yalcin.
Yes; it appears in Ottoman and modern Turkish records as both a personal name and surname.
There is no standard feminine derivative; the name is primarily masculine in Turkish usage.