Greek writings of Celtic names...

[hoplite14gr]

Well I do not know how the Etruscans would pronounce and the pronounciation of ancient Greek is a debate.

Truth is that I though of the phrase as a Greek because Greeks of the time would refer to Folkert as ΟΡΓΕΤΟΡΙΞ Ο ΕΛΒΕΤΟΣ (Orgetorix the Helbetian) or ΟΡΓΕΤΟΡΙΞ ΤΩΝ ΕΛΒΕΤΩΝ (Orgetorix of the Helbetoi)

Cristian offered a very useful insight and I for my self I confess ignorance on how Celts would pronounce

Kind regards