What does the "なん" mean in: "君なんだよ"?


In the song "光るなら" there is a lyric that is:

"君だよ、君なんだよ"

When I translate it, it translates to: It was you, It was you!

Another example is in this lyric from the song "Centimeter" :

"運命なんて言えない"

Which translates to: I can't tell fate. But without the "なん" it seems like the
same thing.

I think that it's changing the delivery of the sentence rather than the
meaning, like ね or よ.

Thanks ☺️




なんだ and なんて are different things.

  * This なんだ is an informal variant of なのだ, which is explained in this answer: [What is the meaning of ～んです/～のだ/etc?](https://japanese.stackexchange.com/q/5398/5010)

Grammatically, it's made of three words, な + ん + だ, where な is the attributive
form of the copula だ, ん is the noun called "explanatory-no", and だ is another
copula. The literal translation of "君だよ、君なんだよ" is "It is you, it is that it is
you".

  * As for this なんて, see: [Usage of なんて and なんか as emphasis](https://japanese.stackexchange.com/q/421/5010)

