RPGMemes

The myths and legends podcast covers them in a good number of stories. I can’t remember any of them but a cursory search shows that Isis and Ra have a story involving true names and their power. https://mythology.stackexchange.com/questions/4770/which-cultures-have-the-concept-of-a-true-or-secret-name

Edit: I completely forgot…the Jews also believed this in regard to God’s name.