(Sanskrit कालिय) A serpent conquered by Krishna. Interestingly, the name is literally Kali (name of a goddess) + ya (vagina). Krishna and Kaliya is the same symbol as Bel and the Dragon, Apollo and Python, Osiris and Typhon, George and the Dragon, Michael and the Devil, etc.
"The river Yamuna was the home of the serpent Kaliya, who made its waters boil with the fires of passion, so that the trees on its banks were blighted by its fumes, and birds were killed by its heat. Krishna, seeing how his friends at Vrindāvana were inconvenienced by this, plunged into the stream, to the dismay of the cowherds, and, after challenging the serpent to fight, was about to slay him. Moved, however, by the intercession of the lady serpents, he allowed him to live on condition that he and his family forsook the Yamuna, and took up their abode in, the sea." - Hindu Mythology, Vedic and Puranic, by W.J. Wilkins, 1900