Sontar (The Infinity Doctors)
General Sontar was the ruler of the Sontarans. He was said to look older than other Sontarans and was important enough to share the name of his people's home planet Sontar. He masterminded the two thousand year war against the Isari. (PDA: The Infinity Doctors)
Sontaran cultures refers to the "betrothal" on Sontar, though to who or under what circumstances remain unclear. (DWM: The Bethrothal of Sontar)
A Sontaran known as Sontar trapped in an Egyptian Pyramid; it is unclear if this was General Sontar or another individual. (DWM: The Gods Walk Among Us)
Behind the Scenes
The suggestion that the Sontarans derive their name from a single person originated from the FASA Doctor Who Role Playing Game which claims that they named their planet after him.