What's the function of て and の in this sentence " これって英語でなんて言うの"


Is the second て here used for the meaning of 'via'? I searched 'なんて', found it
is usually to express emotional feelings and may not fits this sentence. But
for 'via', shouldn't it be 'で'? Like "大きい声で読んでください" and the previous '英語で', so
probably I'm wrong.

And I searched for the usage of last '言うの' but only to find '言うの意味' or
something. What's the final 'の' used for?




You're correct to assume that this なんて is **not** being is used to express
emotion. (Actually, there are [two different なんて that can convey
emotion](https://www.weblio.jp/content/%E3%81%AA%E3%82%93%E3%81%A6); one
expresses derision or dismissiveness, while the other expresses surprise or
admiration.)

In your example, 英語でなんて言うの is just an informal way of saying 英語で何{なん}と言うのですか.
In informal speech, the quotative particle と often becomes って. After words
that end with ん, it instead becomes ￼て, as explained in
[大辞林](https://www.weblio.jp/content/%E3%81%AA%E3%82%93%E3%81%A6):

> て 〔 助詞「って」が撥音「ん」で終わる語に付く場合に用いられる〕 一 （ 格助 ） 「って」（格助）に同じ。 「これはなん－いうのだろう」
> 「ぼくは知らん－答えておいた」

If you try to pronounce なんって, it should be clear why this change occurs.

For the sentence-final の, see @KHS's answer to your question, and also, as
broccoli face - mask cloth suggested in a comment, the answers to [this
earlier question](https://japanese.stackexchange.com/questions/13161/meaning-
of-trailing-%E3%81%AE-in-a-question).




You're correct to assume that this なんて is **not** being is used to express
emotion. (Actually, there are [two different なんて that can convey
emotion](https://www.weblio.jp/content/%E3%81%AA%E3%82%93%E3%81%A6); one
expresses derision or dismissiveness, while the other expresses surprise or
admiration.)

In your example, 英語でなんて言うの is just an informal way of saying 英語で何{なん}と言うのですか.
In informal speech, the quotative particle と often becomes って. After words
that end with ん, it instead becomes ￼て, as explained in
[大辞林](https://www.weblio.jp/content/%E3%81%AA%E3%82%93%E3%81%A6):

> て 〔 助詞「って」が撥音「ん」で終わる語に付く場合に用いられる〕 一 （ 格助 ） 「って」（格助）に同じ。 「これはなん－いうのだろう」
> 「ぼくは知らん－答えておいた」

If you try to pronounce なんって, it should be clear why this change occurs.

For the sentence-final の, see @KHS's answer to your question, and also, as
broccoli face - mask cloth suggested in a comment, the answers to [this
earlier question](https://japanese.stackexchange.com/questions/13161/meaning-
of-trailing-%E3%81%AE-in-a-question).

