Phineas \ph(i)-neas\ as a boy's name. Possibly from the Hebrew name Pinchas, meaning "oracle". The literal meaning of the source form is "serpent's mouth", and indicates a type of oracle. The name may also derive from an ancient Egyptian name, Panhsj, meaning "the Nubian". Showman Phineas T. Barnum; violinist Pinchas Zuckerman.

Phineas has 8 variant forms: Fineas, Phinehas, Pincas, Pinchas, Pinchos, Pincus, Pinhas and Pinkus.

Baby names that sound like Phineas are Phons, Phonz and Phauns.