Etymology
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alter ego (n.)

"second self, counterpart," 1530s, a Latin phrase (used by Cicero), "a second self, a trusted friend" (compare Greek allos ego); see alter and ego.

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wild man (n.)
c. 1200, "man lacking in self-restraint," from wild (adj.) + man (n.). From mid-13c. as "primitive, savage." Late 14c. as a surname.
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ipso facto 
Latin adverbial phrase, literally "by that very fact, by the fact itself," from neuter ablative of ipse "he, himself, self" + ablative of factum "fact" (see fact).
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Sinn Fein (n.)
1905, from Irish, literally "we ourselves," from Old Irish féin "self," from PIE *swei-no-, suffixed form of root *s(w)e- (see idiom). Movement founded 1905 by Irish journalist and politician Arthur Griffith (1872-1922).
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