Malapropisms - learned a new word today and it's a fun one. I do the same thing in my head when I read, any name I don't know how to pronounce becomes something I do know how to pronounce and stays that way for the rest of the story.

One of my favourite things about Brandon Sanderson's fantasy books is that the pronunciation is canonically "whatever goes". Even the author himself doesn't use the pronunciations he originally imagined when writing.

That's the reason why i use latin as base when i name things in fantasy, it both sound good and can't be misspelled

I always read emphasis as "em-FASS-is" just for fun.