Borysthenis
In Greek mythology, Borysthenis (Ancient Greek: Βορυσθενίς, romanized: Borysthenís) may refer to two distinct individuals:

Borysthenes, one of the three Muses that were daughters of Apollo. Her sisters were Apollonis and Cephisso. the Scythian Earth-and-Water goddess Api, who was called Borysthenis because she was the daughter of the god of the Borysthenēs river (now the Dnipro river).