Learn Turkish: Umut diye bir vokal şöhret istiyor ama çok amatör. - A vocal named Umut wants fame but is very amateur.

The word diye is derived from the verb demek (to say/to call). The structure [Name] diye bir [Noun] literally translates to "a [Noun] called/saying [Name]." It is one of the most natural, conversational ways in Turkish to introduce a person, place, or thing by its name to someone who probably hasn't heard of it before.

Could I just use "adında" instead of "diye" here?

Yes, you could say Umut adında bir vokal (a vocalist named Umut), and the core meaning remains exactly the same. The difference is mostly stylistic: adında or isimli sound slightly more formal or written, whereas diye is very common in everyday spoken Turkish.

Why is "şöhret" (fame) not in the accusative case like "şöhreti"?

Because he is desiring "fame" as a general, non-specific concept, rather than a specific fame (like "the fame we discussed"). In Turkish, when a direct object is general and indefinite, it does not take the accusative suffix and is usually placed directly before the verb, just as şöhret is right before istiyor.

Why use "vokal" instead of "şarkıcı" for singer?

While şarkıcı is the generic word for "singer," vokal (borrowed from French/English) is typically used in the context of bands or groups. It usually implies a vocalist in a rock or pop band, or a backup singer (geri vokal), rather than a standalone solo artist.