Now I will have to call it #Mirmingham forever:
"Mirmingham (category Welsh nasal-mutation forms)
Mirmingham (nonstandard) Nasal mutation of Birmingham. In the standard language, non-Welsh place names like #Birmingham do not undergo mutation...."
I really don't understand #Welsh mutation and I'm trying to figure it out properly. Once I do, I'll know when to say Birmingham with a b. I know there really is no such thing as Mirmingham but I am a rebel, Dottie.

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#cymraeg #gymraeg

Search results for "Welsh #mutation" - #Wiktionary, the free #dictionary

https://en.wiktionary.org/wiki/Mirmingham