A difference between “phonetic” and “pronunciation” fields:
If you show Siri how to pronounce a Contact’s last name using the “phonetic” field, the phonetic spelling will be used in the alphabetization of that Contact! I have never been able to find out why that’s done.
Example – Siri always pronounced my friend Dave Baronik’s last name as if it were the word “baron” followed by “ick”, so I entered the phonetic “buhh-RO-nik” and she said it correctly (accent on second syllable, long O)…but for years, the phone has filed him between Budget and Burnham!
This article gave me the idea of trying “pronunciation last name” (and deleting the phonetic one), and his name is now filed and pronounced properly.