Actually, maybe none of you are thinking that. But not being a linguistics expert, I have to refer you to someone who is, Lameen Souag over at Jabal al-Lughat, who also deserves congratulations for his 10th anniversary of blogging. I also recently linked to his posts about the officialization of Tamazight in Algeria.
In this particular link. "Raisins from Carthage to Siwa," Souag, citing a Facebook post, notes that the standard word in Tamazight dialects for "raisin" is usually either a Berber phrase meaning "dried grapes" or is a loan word from Arabic, but that in Djerba in Tunisia, Zuwara and other places in western Libya — and, curiously, at Siwa, the only Berber enclave in Egypt —the root in use is found in a late inscription in Neo-Punic. The root is also documented in Hebrew, as is often how Punic and Phoenician inscriptions are deciphered. (Hebrew, Phoenician, Punic and Canaanite are extremely similar languages.)
Souag, who has written a book on Siwi and its relations to other Berber languages, notes that Carthaginian influence, and Neo-Punic, never extended east of central Libya, so what explains the presence in Siwa of all places? He answers:
The answer is simple, as I discuss in the introduction to my book Berber and Arabic in Siwa (Egypt): modern Siwi seems to derive mainly from a Berber variety spoken much further west, which reached Siwa only during the Middle Ages. There very probably was a Berber language spoken in Siwa before that, but if so, it has left very few traces.I, at least, find that fascinating.