The name of the land of Minahasa has been changed several times: it starts with Batacina-Malesung-Minaesa and then finally the current name Minahasa, which means “becoming one united”. This name dates from the war against the Kingdom of Bolaang Mangondow. In 670, North Sulawesi never developed any large empire, while in North Sulawesi the leaders of the different tribes, who all spoke different languages, met by a stone known as Watu Pinawetengan. There they founded a community of independent states, who would form one unit and stay together and would fight any outside enemies if they were attacked.
The name Minahasa itself rose at the time the Minahasans fought against Bolaang Mangondow. Among the Minahasan heroes in these wars against Bolaang Mangondow are: Porong, Wenas, Dumanaw and Lengkong (in the war near Lilang village), Gerungan, Korengkeng, Walalangi (near Panasen, Tondano), Wungkar, Sayow, Lumi, and Worotikan (in the war along Amurang Bay).
These are the nine subethnic groups in Minahasa (which explains the number 9 in Manguni Maka-9): Tonsea, Tombulu, Tontemboan, Tondano, Tonsawang, Pasan Ratahan, Ponosakan, Babontehu and Bantik. Until the dominance of Dutch influence in the 17th and 18th century the Minahassans lived in warrior societies that practised headhunting. Minahasa Raya is the area covering Bitung City, Manado City and Minahasa Regency, which are three of the seven regional administrations in the province of North Sulawesi, Indonesia.
Sumber : http://www.indonesia-tourism.com/forum/showthread.php?47631-Minahasa-Highland-Where-The-Beauty-Becoming-One-United-Minahasa-North-Sulawesi