Daejeo Island originally constitutes the Daehamyeon region of Daesangmyeon, Yangsangun of Gyeongsang Namdo. It is formed by a large sandy plain at the entrance of the West Nakdong River, and this is how it has originally acquired the name, Daejeo. Located to the north of Daejeongdo, Daeseongmyeon oversaw Chuldoori, Sadeokri, Daejiri, and Pyeonggangri. Daehamyeon, which is located to the south of Daejeodo oversaw Sodeokri, Deokduri, Dodori, Maekdori, and Ulmanri.

Originally, Gangdongdong formed Deokdomyeon of Gimhaegun of Gyeongnam and oversaw four villages including Daesari, Sangdeokri, Bukjeongri, and Jedori. In 1914, it was annexed to Garakmyeon of Gimhaegun but was incorporated to Bukgu of Busan city in 1978. In this process, it was given the name Gangdongdong, because when viewed from the old Garakmyeon, it was situated on the eastern side of West Nakdong River.

The name, Myeongjido comes from the story that whenever there was a natural disaster including large rainfall, devastating famine, and strong wind, a drum or a bell was sounded throughout the entire island to warn the people of sudden calamity. Also, the old name for Myeongji was Myeongho, and even to this day, the elderly continue to use that name.

The origin of the name of Garakdong is not easily discovered in documentary records, but according to Gimhae Geography, Garak refers to an area that spreads over the Nakdong waters, thus designating a region adjacent to a large body of water. Until 500 years ago, the island was uninhabited, but residential houses began to appear there as people moved to the Island, while keeping Juk Island as a base site. Afterwards, the island came under the jurisdictional authority of Gimhae, and during government restructuring in the latter Joseon era in 1895 (32nd year of king Gojong), it became Garakmyeon, Gimhaegun. And it was only then that the island acquired the name, Garak.

There are two versions of how Mt. Nok acquired its designation. The first name carried the meaning of Deer Mountain but was later changed to its second name, Jointhead Arthraxon Mountain. In other words, according to the theory of foretelling based on geography, because the eastern part of Bonghwa mountain is a propitious site of a record night and day type, which showed a shape of a hungry deer galloping across a field, it was referred to as a Deer Mountain. However, it seems appropriate to see the designation, Jointhead Arthraxon Mountain as having come to be widely used following the reference to Nok Island which is seen as small as a mung bean. This is so because prior to the designation of Mt. Nok, Nok Island was indicated in the Volume on Gimhae Map of Yeojidoseo publication and one can also see the designation of Nok Island, since in the salt farm related account found in the Chronicles of Joseon Dynasty in the 11th year of king Sunjo, it was referred to as Myeongrok Yangdo. To elaborate, Nok Island was just one small island until the time when Yeojidoseo was compiled, but it appeared that there was a trend toward it becoming a part of the mainland due to the development of the delta at the Nakdong River mouth. After the early part of the 19th century, although it was recorded as an island, there is a good possibility that it was already connected to the mainland based on the fact that salt farm was flourishing there as well as on Myeongjido.

The origin of the designation, Cheongadong can be traced to the 37th year of King Joongjong of Joseon era, when Cheonseong Manhojin and Gadeokjin were established on Gadeokdo to ward off Japanese invasion. In 1906, Cheonseongmyeon and Gadeokmyeon of Wooncheongun were established and afterwards, Doomyeon were combined in 1908. The name Cheongamyeon was given by selecting the first letters of Doomyeon.