〜という
called, named
Name + という + Noun
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Name + という + noun means "a … called X": 山田という人から電話がありました, "there was a call from someone called Yamada". Literally "a person one calls Yamada".
It's how you introduce a name the listener might not know: a person, a shop, a book, a place. これは何という花ですか asks "what's this flower called?"
Compare の: 山田の人 would be "Yamada's person", which isn't what you mean.
In casual speech it's often shortened to って: 山田って人, "some guy called Yamada". And a very common set phrase is と申します, the humble way to give your own name: 田中と申します.
Examples
山田という人から電話がありました。
There was a call from someone called Yamada.
「千と千尋」という映画を見たことがありますか。
Have you seen a film called "Sen to Chihiro"?
これは何という花ですか。
What's this flower called?
駅の前の「さくら」という店で会いましょう。
Let's meet at a place called Sakura in front of the station.
私の町には「みどり」という公園があります。
There's a park called Midori in my town.