Coincidentally, my DS came home from school this week and complained that his history teacher had mispronounced the name of Hippocrates (ancient Greek medical expert). Apparently the teacher was pronouncing 'crates' as one syllable, like the English word 'crates', so DS said that he politely tried to help the teacher by pronouncing it loudly as 'Hip-POK-ruh-tees'.
I confess I had a second of huge amazement and pride at my DS knowing how to pronounce Hippocrates. I swear I have no clue why he knows this.
What I said to DS though was that mispronouncing names doesn't mean you're not clever. It means you've read more things in books on your own than you've actually heard people say to you out loud.
As a child I read avidly and created (wrong) pronunciations of many words in my head. As an adult with a postgrad degree, I still sometimes discover that I've been pronouncing a word wrong.
All this to say that a teacher mispronouncing a name wouldn't worry me in the slightest. The question is whether the teacher is getting the kids interested in Tanzania or Ithaca or whatever.
DS loves his history teacher (by all accounts she is very good) and I wanted to make sure that she retains her authority in his eyes.
I've seen the pictured quote pop up now and again on social media; it's basically what I said to DS.