Librarians and archivists created the Iwi Hapū Names List to make it easier to find useful, relevant information about specific iwi and hapū in Aotearoa New Zealand. The List has its origins with work begun by poet-librarian Robert Sullivan in 2001. It’s based on waka, iwi, and hapū names used to describe collections at the Alexander Turnbull Library, and Te Taura Whiri | Māori Language Commission has reviewed it. It’s not a dictionary though and is not meant to be an authority outside of libraries and archives.
See the National Library Iwi / Hapu List for further details.
Pūkaki : te hokinga mai o te auahitūroa by 
A Long Time Coming by Note: Ngā Upoko Tukutuku is a thesaurus of topical terms only. It has no place names (i.e. geographical headings).
Resources about places are catalogued using Library of Congress geographical subject headings if available, or the terms used in The New Zealand Gazetteer of Place Names.
To find a result about Ōtepoti/Dunedin using subject searching, you would need to use the Library of Congress Subject Heading Dunedin (N.Z.). (However a keyword or title search would find items with "Ōtepoti" in the title or description.)
Source: https://natlib.govt.nz/librarians/iwi-hapu-names/k%C4%81i-tahu