Miyajima (宮島) is a Japanese surname meaning "shrine island," derived from the elements miya (temple, shrine, palace) and shima (island). The name originates from the island of Itsukushima, commonly called Miyajima, located in Hiroshima Bay. This island is famous for the UNESCO World Heritage Site Itsukushima Shrine, whose iconic torii gate appears to float on water during high tide. The shrine's history dates back to at least 593 AD, with major contributions by the powerful 12th-century warrior-courtier Taira no Kiyomori, who gave it its current form. The name Miyajima thus carries strong historical and cultural associations with this sacred island and the Shinto shire.
Sources: Wikipedia — Itsukushima