Pronouncing names in different languages with Siri
Solution 1:
After comments & several years after the original question…
For my own situation, re my partner's 'foreign' name, Siri does actually now know how to pronounce it almost correctly.
It still appears though that if you want Siri to more easily recognise foreign names or words, pronounce them like "an Englishman abroad" - ie just Anglicise it, however badly, & Siri will often make a better guess at what you said.
It really does remind me of the [now terribly un-PC] advert from the 70s
"Avez vous un cuppa?" - https://www.youtube.com/watch?v=pbvq-kZMWIA