i know, but you can not know without assuming. many outside English speaking countries know to ask for a pronunciation, rather than assume. if someone has enough knowledge to judge that a name is not English, it doesn't take a genius to realize that oh wait, maybe it doesn't go by English pronunciation rules.
also, even if an anglophone does not know another language, they can (and should, if they're able to) at least be familiar with a few pronunciation rules of other kinds of languages- not even specific languages, but language groups. like, how if a non English and non French word/name ends with -e, it is most likely not silent, and so said as a new syllable. not to better assume a pronunciation you're unsure of- but part to have a better chance of reading it and saying it properly when told how to, and mainly for the sake of being able to understand how weird English pronunciation rules really are, and that yes, there are languages besides English. that there's a whole world out there.
i've met plenty of people who've been stumped by mine and my family's names, but have gone "ah, ok", when told/explained how it's said; and then i've met plenty more people who seemed to not comprehend how our names could exist.