I am having the same issue and it’s driving me nuts. Previously when you could voice dictate the proper pronunciation to Siri, it worked fine. Now that you’re only option is to add the phonetic pronunciation in contacts, it never works. I’ve even taken it to the Apple Store and show them every step I’ve taken, and the genius has informed me that there was nothing more I could do and they just haven’t figured this one out yet.
My wife’s name is Briona. Pronounced Bree-on-a.
Additionally, voice to text will never get the spelling of her name correct. I have even gone into the keyboard settings and changed every single alternative spelling of her name to be a keyboard shortcut to her actual name. Even though these are all in place, every single time I try to voice dictate her name in text, it gets it wrong. Even the accurate spelling of her name never shows up as alternatives in the keyboard.
Apple: Please figure this one out. The diversity of your users needs to be reflected in its capacity to pronounce different names. Please put more resources towards this issue. It’s driving users nuts.