Here are some ideas for what this thing could be called:
Wellington Tenants Union
The good: “Tenants Union” is the term most commonly used overseas for these types of organisations and there also a Manawatu Tenants Union. There was a Wellington Tenants Union in the 1970s so there is a nice historical connection there.
The bad: As already discussed, I’d prefer to use the term “renter” over tenant and for some (not me) union can variously have a militant, stuffy, out-of-date or rigid connotation.
Tenants Protection Association
The good: This is the name of existing similar organisations in Christchurch, Auckland and Hamilton.
The bad: Has a strong advocacy focus, both in reality for the existing organisations and in its description (protecting tenants, not organising them to defend their own rights).
The good: Has “rent” in it and there is an NGO in Britain that is interested in similar issues with this name.
The bad: Generation Rent in the UK is very much in the NGO mould, as opposed to being a member-driven democratic activist thing. It also feels to me like it is focussed on young people (perhaps due to the association with Generation Zero).
The good: Uses the word renter and provides a sense of unity without saying union.
The bad: Doesn’t mention Wellington (Wellington Renters Together doesn’t work I don’t think), possibly a little passive sounding?
Wellington Renters / Renters Wellington
The good: Has who and where right there on the tin.
The bad: Doesn’t say what it is or give a sense of collectivism or unity.
I’d love to here what you think of these options or any other ideas you might have.