[lucb1e]

Took me a while to understand, so to make it explicit for anyone else:

Arnaud and Arno sound the same! (in this language pair.) In Dutch, I know both an Arnaud and an Arno, and it's pronounced correctly^W like you read it (IPA: /ɑrnʌud/ and /ɑrnoː/) so that threw me off probably.

Anyway, your request is a bunch of human labeling work if there isn't already IPA conversions for every name (and if LLM can't already guess correctly 95% of the time and that's good enough for an initial comparison), but from an algorithmic standpoint shouldn't be hard: use the same comparison but on phonetic spellings of the names rather than language-specific spellings. Example: in Dutch, we pronounce "u" like IPA /y/, whereas German pronounces it as /ü/, so any name with "u" in it will automatically be incompatible pronunciation-wise.