N3
という
Called, Named, Known as, As much as
ローラというモデルさんを知っていますか？
Do you know the model called Rola?
Explanation
「Aという B」 means 'a B called A'. Use it to introduce a name the listener may not know: 「『君の名は』という映画」 (a movie called 'Your Name'), 「田中さんという人」 (a person named Tanaka). It can also follow a whole sentence to give the content of a rumor, news or opinion: 「会社を辞めるという噂を聞いた」 (I heard a rumor that he's quitting the company).
Mixed up with
In speech it often becomes 「っていう」: 「田中っていう人」.
Adding 「という」 to something the listener knows well sounds unnecessary, as if you took them for a beginner.
After an amount, 「という」 stresses that it is a lot: 「一万頭という牛」 (as many as ten thousand cattle).