Tuisto
Tuisto or Tuisco was according to Tacitus (Germania Ch. 2) the ancestor of all Germanic tribes. He was the father of the first man, Mannus. He was worshipped with human sacrifice. According to Jakob Grimm, his name and variant forms (Thuisco, Thuiskon, Tuisco) come from the adjective tivisco derived from the name of the god Tiu; the name Tiu in turn derives from the proto-indoeuropean root *dyeu meaning "daylight sky" (the names of many other deities also derive from this root, such as Jupiter, Diana, Zeus, Dione, Tyr, Dyavaprthivi, Devi and Asmodai), and the adjective derived from it could meaning either "celestial" or "son of Tiu".
