I kinda wonder if North West England might see a Good be with ye ➡️ Good be ye ➡️ Goodbye happen to the phrase ‘av a good un’ (have a good one)

It’s already spoken as if it’s one word, as avagud’un effectively

Rebracketing: when a word or term “steals” or has letters “stolen” from it, and then changes form through that. A Norange ➡️ An Orange, An Ewt ➡️ A Newt, Good be ye ➡️ Goodbye