ZIO.  A deity of the Suevians, answering, it is supposed, to the sword-bearing god Tyr of the Scandinavians. (An Archaic Dictionary, Cooper, 1876).

... Only a small stock of the Teutonic divinities can be traced with certainty to the Indo-Germanic period.  In Scandinavian tivar, a collective designation of the gods, and in the name Tyr, Old High German Zio, we have the shining sky-god of the prehistoric myth, reflected by Sanskrit devas, Lithuanian dëvas, Old Irish dia, "god," Lat. divus, "divine."  The direct equation of Tyr, Zio, with Vedic Dyðus pitar, Greek Ζεύς παθήρ, Lat. Jupiter (q.v.), has been questioned, but there is no doubt that Tyr, Zio is the prehistoric sky and day god. (The New International Encyclopaedia, Gilman-Peck, v.17, 1909)