How do you spell nefyou?

The spelling "nefyou" doesn't appear to be a correct word in the English language. It's possible there's a misspelling or it might be a slang term or name.

Can you please provide more context or clarify what you are trying to spell? For example:

* What is the word supposed to mean?

* Where did you encounter this spelling?

* Are you trying to spell a name?

Once I have more information, I can help you find the correct spelling.