This is my understanding............

In NZ there is no legally defined suburbs (There might be one or 2 exceptions in Wellington and/or North shore?)

Therefore all mapping services do what ever

But the closest thing to official is the NZ fire service

http://www.linz.govt.nz/about-linz/our- ... bs-dataset

Its free but you need to sign up

in 90% sure google maps use the NZ fire service maps

I wonder if adding a place would be more appropriate

https://support.google.com/waze/answer/6262592?hl=en