~と呼ばれる (is called)

The pattern [name]+と呼ばれる ('called X / known as X / is called X'), using the quotative と with the passive of 呼ぶ. Embeds a name as a noun-modifying clause: ~と呼ばれる + noun = 'noun called X.' Often appears in ~ている form for habitual/customary naming: ~と呼ばれている ('is (generally) called X').