Celt
n.
also Kelt, c.1600, from Latin Celta, singular of Celtae, from Greek Keltoi, Herodotus' word for the Gauls (who also were called Galatai). Used by the Romans of continental Gauls but apparently not of the British Celtic tribes. Originally in English in reference to ancient peoples; extention to their modern descendants is from mid-19c., from French usage.