Oh here we go. I feel like a fool for not going straight to East Africa first.
Looks like the best claimant is Waaqa, sky god of the Oromo people. https://procaffeination.com/who-is-the-god-of-coffee-procaffeination-lists-the-top-contenders/
And here, it's Double Deities Thursday so have a bonus Mayan cocoa god free of charge. https://en.wikipedia.org/wiki/Ek_Chuaj
@zebratron2084 Oh, I hadn’t seen that and didn’t know about Waaqa. That is probably a better answer.