I’ve been sent a copy of a very lengthy paper (101 pages long) that finds that pre 1840 Auckland was never referred to as Tāmaki Makaurau. They assert it was constructed in the 20th century from a proverb which originated in the 1860s
I do not have the knowledge or skills to judge if the paper is correct. But it is a very serious paper with 226 referenced footnotes. I have embedded it below so people can read it for themselves.