Hi Somnoth,
Thanks so much for the information. I was able to change my name back in my iPhone settings like you suggested.
Can you help me understand why it changed on it’s own? Two weeks ago, I believe I was hacked because under my google/gmail account settings my bday and name was changed. I changed it back to the correct info, which fixed my email display name in the iPhone mail app. This week, it changed back to the same wrong name, but it wasn’t changed in my gmail settings.. why/how was it changed in my iPhone settings without me touching it?