BTW there's no evidence that the word has Turkic roots. "Keyif" means "enjoyment" but Kefir has no shared roots with it and "keyif" itself comes from Arabic. W

BTW there's no evidence that the word has Turkic roots. "Keyif" means "enjoyment" but Kefir has no shared roots with it and "keyif" itself comes from Arabic. Whatever its original root is, last verifiable root is Russian "кефир", according to Sevan Nişanyan ( Turkish: https://www.nisanyansozluk.com/?k=kefir https://www.nisanyansozluk.com/?k=kefir )