The first twenty letter names of both Slavic alphabets are ordinary Slavonic words and read together as connected sentences, from azu buky vedi, I know letters, through rtsy slovo tverdo, say the word firmly. After that point the names stop meaning anything recoverable. The reference literature records them as of uncertain or unknown origin and offers no reading. This is not a disagreement between scholars with rival etymologies; it is an absence. Nobody has established whether these names are corrupted Slavonic words, reflexes of Greek letter names, or labels that never meant anything at all, and the question has not been taken up.
What would resolve this A systematic etymological study of the full set of Slavic letter names, working from the earliest abecedaria and from the acrostic alphabet poems of the Old Church Slavonic tradition, which arrange the names in verse and may preserve senses that the plain lists do not. A finding that the names are demonstrably meaningless would settle the question as firmly as a set of etymologies would.
OpenSlavic historical linguistics; Old Church Slavonic philologyPeter T. Daniels and William Bright (eds.), The World's Writing Systems