Nothing to worry about, minor typos and mistakes occur in passenger names all the time. Provided that the name on the ticket looks like the name on the passport then there is nothing to worry about, you don't need to change the ticket.
Check in staff are used to passenger names being somewhat mangled just because the technology the airline backend systems being so antiquated.
Just rock up to check in and act 100% normal, obvs do not draw attention to the typo. And if in the rare chance it's queried then just shrug and act surprised and partly apologetic, but I really don't think it will get to that.
Edit to add - welcome to Flyertalk! Enjoy your flights and your trip to AKL, New Zealand is a truly amazing place