Also from From Brewers dictionary of Phrase and Fable 1898:
Tory: This word, says Defoe, is the Irish toruigh, used in the reign of Queen Elizabeth to signify a band of Catholic outlaws who haunted the bogs of Ireland. it is formed from the verb toruighim (to make sudden raids). Golius says -"TORY, sivestrus, montana,avis, homo,et ultrumqueullus haud ibi est" (Whatever inhabits mountains and forests is a Tory). Lord Macaulay says - "The name was first given to those who refused to concur in excluding James from the throne," He further says - "The bogs or Ireland afforded a refuge to Popish outlaws, called tories." Tory hunting was a pastime has has even found place in our nursery rhymes - "I went to the wood and killed a tory".
F. Crossley gives as the derivation, Taobh-riogh (Celtic), "king's party."
H.T.Hore, in Notes and Queries, gives Tuath-righ, "partisans of the king."
G. Borrow gives Tar-a-ri, "Come, O king."