[0zymandiass]

I don't know if it works there, but siri couldn't understand one of my contacts names

When it read back super incorrectly from an alias, I said something to the effect of "could you pronounce that correctly?" and it asked me to say it

Since then, it's understood that person's name. ¯\_(ツ)_/¯

It really needs to expose the option to train those easily

[LeoPanthera]

Indeed, you can say "That's not how you say that" to correct its pronunciation of any name.

[cachvico]

There is a "Pronunciation" field in the contact where you can spell out how a name is pronounced.

This article clears everything up, https://discussions.apple.com/thread/8116586