Italian cembro, cembra, cirmolo 'Swiss pine (Pinus cembra)' is cognate to Friulan cirmul, Ladin cirum, zirm, Raetho-Romance ğèmber (Engadin), žember (Bergün/Bravuogn), Romanian zâmbru, and High German Zirbe, Zirbel, Zirbelkiefer. This would point to a substrate loanword *kemro- ~ *kirmo- which my colleague Marco Moretti considers to be of Tyrrhenian (Rhaetic) origin.
Another name for the Swiss pine used in Switzerland is Arbe, Arve < *arbo-, with loss of the initial postvelar and denasalization.
For these words I'd propose a Vasco-Caucasian etymology from Caucasian *qq’wǝmV 'grain, fruit stone', Sino-Tibetan *kuam 'fruit (with) kernel', Yeniseian *ʔem- (~ x-) 'cone (of a coniferous tree)'.
This etymology would be also the source of Greek kônos 'cone', Altaic *tʃhumu 'seed; cone' (Mongolian, Tungusic)1 and Paleo-Basque *sini > Basque zi (S, Z), zĩ (R) 'oak acorn', with palatalization of the initial velar.