Which Braavosi courtesan Arya meets in the novels was omitted from Game of Thrones?

The Black Pearl is the Braavosi courtesan Arya meets in the novels but Game of Thrones omits.

Arya encounters the Black Pearl while living in Braavos under the identity Cat of the Canals. As she sells oysters, clams, and cockles from a barrow, she sees the city’s famous courtesans traveling by barge. The Black Pearl is one of Braavos’s most celebrated figures, and Arya sells her three cockles during their brief encounter.

“The Black Pearl” is a hereditary title as well as a nickname. The current bearer in the novels is Bellegere Otherys, descended from an earlier Black Pearl who was a pirate queen and lover of King Aegon IV Targaryen. Several women in the Otherys line carried the name.

The Daughter of the Dusk is an easy mix-up because the Kindly Man mentions both courtesans when offering Arya an alternative life. Septa Mordane belongs to Arya’s earlier Westerosi story, while the Waif is her Faceless Men rival. None is the Braavosi courtesan named in the question.