Some scholars claim that the Semitic ג (gîmel) was the picture of a camel. /k/ developed palatal? and velar? allophones in Latin, probably due to Etruscan influence. Therefore, C has many different sound values today, among them /k/ and /s/ in French, /k/ and /T/ (like English TH in THIN) in European Castilian?, /k/ and /tS/ (like English CH) in Italian and so on.
See G.