"Ñuha muña Targārien issa."

Translation: My mother is a Targaryen.

[G-vei]

Why is the article "a" needed before Targaryen?

[Aeronautix]

I reported it, "My mother is a Targaryen" seems equal to "My mother is Targaryen".

Unless there's an exclusively adjective form of "Targārien" that exists.

[KirstenGra12]

I would think it's because generally that's what you'd say. Like I'd say, "My ex was a Grant", not "My ex was Grant", because that was the ❤❤❤❤❤❤❤'s last name.

[Gorgeoth]

So, Targaryen is a family name or a lan name and not a race, then?
It accepts the definite as well as the indefinite article but does not accept not article.
That suggests that Targaryen is a clan or family name, not a race, tribe, or geographical affiliation.
No, I have never watche Game of Thrones.