Based on the provided source material, Yoan is not a city in Japan. Rather, it is identified as a given name shared by various notable individuals across different fields and nationalities.
Notable people with this name include artists such as Cuban sculptor Yoan Capote and Bulgarian painter Yoan Leviev. Other figures include athletes like French footballer Yoan Gouffran, Cuban baseball pitcher Yoan López, and Major League Baseball player Yoán Moncada.