Apache

• Away up at the sources of the Gila, where the pines and cedars stand and where creeks and valleys are found, is a part of the Apache land.1895, J[ohn] W[esley] Powell, chapter I, in Canyons of the Colorado, Meadville, PA: Flood & Vincent; republished as The Exploration of the Colorado River and Its Canyons, New York: Dover, 1961, →ISBN, →OCLC, page 24:

• But the brain, and the agility, and the muscles that had coped with the mighty strength and cruel craftiness of Terkoz and Numa in the fastness of their savage jungle were not to be so easily subdued as these apaches of Paris had believed.1913 June–December, Edgar Rice Burroughs, “What Happened in the Rue Maule”, in The Return of Tarzan, New York, N.Y.: A[lbert] L[evi] Burt Company, […], published March 1915, →OCLC, page 35:
• “He had the big paper knife in his hand, and ‘Mind, Dorcas,’ he says, ‘you’ll have to be very respectful. This is my specially sharpened scimitar, and it’s off with your head if I’m at all displeased with you!’ Miss Cynthia, she was what they call an Apache, or some such name—a Frenchified sort of cut-throat, I take it to be. A real sight she looked. You’d never have believed a pretty young lady like that could have made herself into such a ruffian.”1920, Agatha Christie, The Mysterious Affair at Styles, London: Pan Books, published 1954, page 115:

Plural only "Apaches"