This is the 5947th most frequent Polish word.
zwane
"Zwane" means "called" or "referred to as."
Here, 'zwany' acts as a past participle, describing someone being referred to by a specific name.
Zwany przez przyjaciół 'Kowalem', był znakomitym rzemieślnikiem.
Called 'Kowal' by his friends, he was an excellent craftsman.
In this sentence, 'zwany' is used to introduce a descriptive title commonly given to the region.
Region ten jest zwany 'Zielonymi Płucami Polski' z powodu bujnej roślinności.
This region is called 'The Green Lungs of Poland' due to its lush vegetation.
'Zwany' here attributes the content of the section being referred to by a specific name.