You can get yourself a vanity key using https://github.com/AlexanderYastrebov/wireguard-vanity-key tool:
% wireguard-vanity-key -prefix=NAS/
private public attempts duration attempts/s
EiBsDB8zt/G4+VWGvxW2ZznNXYmcslcIyJimNR2PpF4= NAS/aex8+IFzLePBYVNGMsSo/1/XeUZcam+Hn8wbNB4= 22619537 0s 112587360[dead]
While it's cool, something about vanity keys in general stroke me the wrong way. I feel like in principle you should never use a very short part of a public key for ocular identification, and it attempts to solve something that should be solved outside of wireguard, i.e. the "friendly naming" of public keys.