I would be willing to consider such a question as on-topic. It is useful for researchers in mathematics. Definitive answers are possible, at least in cases where someone can report on the pronunciation of a personal name by the individual concerned. Answers are not readily available anywhere else. I see no harm in it.
This might be most useful as a big list question. Someone can ask for a list of the most problematic pronunciations, and people can provide answers in phonetic renderings or links to audio files. I think it would be good to have two or three big list questions around pronunciation rather than a scattering of tagged questions.
Gerhard "Pronounces His Name Three Ways" Paseman, 2018.03.22.