(Βάκις), seems to have been originally only a common noun derived from βάζειν to speak, and to have signified any prophet or speaker. In later times, however, Bacis was regarded as a proper noun, and the ancients distinguish several seers of this name.
A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890