Giyan, also Romanized as Gīyān; also known as Kīān, Qīān, and Qayān, is a city in, and the capital of, Giyan District of Nahavand County, Ha…Giyan, also Romanized as Gīyān; also known as Kīān, Qīān, and Qayān, is a city in, and the capital of, Giyan District of Nahavand County, Hamadan province, Iran. It also serves as the administrative center for Giyan Rural District.