Nonce is from "then anes", meaning "the one".
The "-n" got smooshed into the latter word, to become "nonce", rather like "an ewt" became "newt".
Then there's a lot of master/slave terminology.
https://www.dailywritingtips.com/nonce-words-for-the-nonce-a...
Also, GP's "Surfari" doesn't sound like a word meant to be used once, but as a word meant to be funny and with high probability of becoming a piece of jargon between a band of friends. My wife & I invent words like these all the time (half of them being born from misspelling or moments of confusions). Are they "nonces" too, even though we keep using them?