antelope (n.) Look up antelope at Dictionary.com
early 15c., from Old French antelop, from Medieval Latin antalopus, anthalopus (11c.), from Late Greek antholops (Eusebius of Antioch, c.336 C.E.), in reference to a fabulous animal haunting the banks of the Euphrates, very savage, hard to catch and having long saw-like horns capable of cutting down trees. In modern zoology, the name was applied c. 1600 to a living type of deer-like mammal of India. In the western U.S., the name is used in reference to the pronghorn.

Original sense and language unknown (it looks like Greek "flower-eye," as if from anthos + ops, but that may be Greek folk etymology). It figures in heraldry, and also was known in Medieval Latin as talopus and calopus.