Was J.R.R. Tolkien mit Albus Dumbledore zu tun hat

She might have, as I already said – but then, fully believing in the righteousness of these dictionaries, she would have learned a meaning different from the one she mentioned: the word “dumbledore” seems to regionally belong to the counties of the south-west (Devon, Somerset) but she mainly lived in Gloucestershire. Geographically speaking she might rather have heard the “cockchafer” version, explaining the “humming” or rather “buzzing” sound Dumbledore was supposed to make all the time. And for the fun of it: a “rather stupid fellow” was closer in meaning to her native Gloucestershire than the other two options.

I am not knowledgeable enough about the regional dialects of England but judging from a German point of view I can tell you that some words change meaning (and spelling) if you travel from village to village (or rather beyond a hill.) It is a long way from Somerset to Devon to Gloucestershire. There should be change in meaning …