`if we go historic way. word bag was azeri (in a time most pople in south azerbaijan and some in borth azerbaijan were speaking persian or another indo-aryan language like syth or kurdish)and word ``kara`` from Turkik root came to azeri language after turk immigration in 800 or 1000 or 1400 years ago. azeris words are combination of Turkic and Farsi origin (and now farsi has 60% Parsi and 40% Arabic)  `