Where does “Waikato” come from?

Waikato (English) comes from Maori waikato, from Maori wai, from Proto-Eastern Polynesian wai, from Proto-Nuclear Polynesian wai, from Proto-Polynesian wai, from Proto-Oceanic waiʀ, from Proto-Eastern Malayo-Polynesian waiʀ, from Proto-Central-Eastern Malayo-Polynesian waiʀ — water.

Ancestry of “Waikato”, step by step

StepLanguageWordMeaning
1Maoriwaikato
2Maoriwaiwater; liquid; who?
3Proto-Eastern Polynesianwaiwater
4Proto-Nuclear Polynesianwaiwater
5Proto-Polynesianwaiwater
6Proto-Oceanicwaiʀwater
7Proto-Eastern Malayo-Polynesianwaiʀwater
8Proto-Central-Eastern Malayo-Polynesianwaiʀwater
9Proto-Malayo-Polynesianwahiʀwater
Every word from Proto-Malayo-Polynesian wahiʀEvery word from Proto-Central-Eastern Malayo-Polynesian waiʀEvery word from Proto-Eastern Malayo-Polynesian waiʀ