This is the 7342nd most frequent Portuguese word.
marquart
The word "marquart" does not appear to be Portuguese. It may be a name or misspelling.
As a proper noun referring to a surname.
Eu sei que Marquart é um sobrenome tradicional num livro que li.
I know that Marquart is a traditional surname in a book I read.
As a proper noun used metaphorically.
Ele mencionou Marquart como um símbolo em sua palestra.
He mentioned Marquart as a symbol in his lecture.
As a proper noun referring to a geographical location.