Sicel

2010, Philip Baldi, The Foundations of Latin, Walter de Gruyter (Mouton de Gruyter) page 116, Their language, Sicel or Siculan, is considered by most scholars to be an independent IE language whose deeper connections with Italic are poorly demonstrated.

In Sicily were spoken at least two languages during the first millennium BC that are widely thought to have been Indo-European. The first, Sicel (or Siculian), was spoken by the Siculians in eastern Sicily.

Although the contribution of the Sicel language to coin inscriptions is not great, there is another case where Sicel is often invoked, and which unusually is not a proper name.