User blog comment:Arathorstories/Druids, Celts, and Paganism/@comment-6335668-20140810172923/@comment-644222-20140810183252

I'll be god honest I'd seen it on Wowpedia ages ago. I'd be lying if I said I remembered which book it was from. Either way, I'm still hoping people move towards mixing paganism as well rather than just going default celtic. Though, Celtic seems to be the go-to one I'd assume because it's typically what people think of when someone says pagan. (At least it is personally.)