Celt

Celt, Celtic, p.n., adj. ("kelt," "kel tik") 1. a member of a division of the early Indo-European peoples distributed from the British Isles and Spain to Asia Minor; from Latin Celtae, Greek Keltoi "barbarian"; c. 1550. See druid. 2. a modern Gael, Highland Scot, Irishman, Welshman, Cornishman, or Breton. [EDE]
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Addendum: Since gamers are often fascinated with all things Celtic, let's take a quick look at who the Celts were and are. The Greek word "keltoi" referred to anyone who lived north of Greece (also Greek galatai and Roman galli, the origin of Gaul); so if you want to talk about the "Ancient Celts," you might mean any of the pre-Christian peoples of Europe. But as time has progressed, the word has come to specifically mean members of ethnic groups that speak one of the so-called "Celtic" branch of related Indo-European languages; Gaulish, Welsh, Breton, and Irish. In this sense, "Ancient Celts" means the ancestors of these non-Germanic Northern European peoples.
To dispel two common myths: first, by any reasonable definition of the word "Celt," the Celts did not build Stonehenge. The monolithic structure was built way too early to be assigned to any later ethnic group that inhabited the same area. Second, the only "Seltics" play basketball in Boston. It is never appropriate to pronounce Celtic with an "s" sound. [EDE]