celts

[RJC1972]

wheres does the word "celts" come from and what is it's meaning

[Clanad]

Accodring to New World Celts, The origin of the word Celt is from the Latin celtae, and refers to, according to Webster,
"a member of a division of the early Indo-European peoples in Iron-Age and pre-Roman Europe distributed from the British Isles and Spain to Asia Minor and in part absorbed into the Roman Empire as Britons, Gauls, Boii, Galatians, or Celtiberians."
OR
"a descendant of these people who has somewhere in his background a native knowledge of the Celtic language."
OR
"a modern Gael, Highland Scot, Irishman, Welshman, Cornishman or Breton."

[Quizmonster]

To add a little to C's answer above, the word comes from both Latin (Celtae) and Greek (Keltoi). It is because of the double source that the word's adjective form, 'Celtic', is pronounced in two different ways.
For example, the name of the Glasgow football team, Celtic , is pronounced with a soft C...Seltic, whereas the peoples described by C are usually pronounced with a hard C...Keltic.

[Clanad]

I'd always wondered about that, Q... thanks!