Yes definitely Manawanui - typical press although you'd think something as fundamental as a vessels name would've been correct on a Naval related site...duh!Never mind. Found it. Manawanui it is. NavalToday.com got it wrong I guess.
For some strange reason I thought the RNZN already had a Seaeye Cougar... but this article suggests it's new... certainly a capable ROV for u/w utility tasks: COUGAR BEST FOR ROYAL NEW ZEALAND NAVY | Saab Seaeye