My Uncle was always known by the surname of his Father. Is there any records I can check - when he changed his name? Would the Father been able to change the surname?
Hi again
Hopefully there'll be something for you amongst NZSG school records

(see earlier post).
If that doesn't prove helpful, you could try electoral rolls. Your uncle would have supplied his own information upon enrolment to vote.
Yes, the Father (or any other guardian of a child) could change the name ... but to avoid prosecution, there would need to be a valid or compelling reason for doing so.
[The same applied to adults - changing or altering their names. ]
~ Lu