Two helpful sources for finding the names of early towns and geographical features are:
United States. Board on Geographic Names.Hawaiian Islands: Official Standard Names. Washington, DC: Government Printing Office, 1956. (FHL book 996.9 E5U; film 1033989.) Use of this book requires geological survey maps.
Pukui, Mary Kawena. Place Names of Hawaii. Honolulu, Hawaii: University Press of Hawaii, 1974. (FHL book 996.9 E2p.)