How do you pronounce tac nayn?

"Tac nayn" doesn't appear to be a word in any common language. It's possible you're referring to a name, a specific term, or a misspelling.

Could you please provide more context?

For example:

* What language is it from?

* What is the word supposed to mean?

* Is it a name?

With more information, I can help you figure out the pronunciation.