Pavane and Smallpiper:

A certain type of ancient stone axe is called a "celt," with a soft c (pronounced "selt") but I don't think it's named after the peoples, who were called "Keltoi" by the greeks, and hence the word.

Pottery has been used to define ancient peoples, but the "La Penne" referred to is actually La Tene, and it is an archaeological site in Switzerland characterized mainly by beautiful decorative metalwork. It is for this metalwork that the Celts of this period are now famous in archaeology circles.