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c.1300, from French Turc, from Medieval Latin Turcus, from Byzantine Greek Tourkos, Persian turk, a national name, of unknown origin. Said to mean "strength" in Turkish. Cf. Chinese tu-kin, name given c.177 B.C.E. as that of a people living south of the Altai Mountains (identified by some with the Huns). In Persian, turk, in addition to the national name, also could mean "a beautiful youth," "a barbarian," "a robber."
Meaning "person of Irish descent" is first recorded 1914 in U.S., apparently originating among Irish-Americans; of unknown origin (Irish torc "boar, hog" has been suggested). Young Turk (1908) was a member of an early 20c. political group in the Ottoman Empire that sought rejuvenation of the Turkish nation. Turkish bath is attested from 1640s; Turkish delight from 1877.
A contention over the rights to a certain activity, location, etc: We get eye-glazing accounts of turf wars between the Council on Economic Policy and the Commission on International Trade and Economic Policy/ Faget suspected a turf battle for control of the Mercury program (1950s+)