The Ossetian grammar textbook mentions the "-ag"/"-ak" suffix as one of the most common in the language. But it does not provide its etymology. We know that in the Georgian dictionary there are a huge number of words ending in "-აგ"/"-აკ" (ag/ak). And they are not borrowed from Ossetian. We know that suffixes are former roots, that is, they are separate words that have lost their independent meaning over time. Therefore, you just need to check what "აგ" is in the Georgian dictionary.
It is the demonstrative pronoun "this" (dictionary of Chanturia). This is exactly what they say in Guria, while in the rest of Georgia they say "eg"/"egi" (remember "Pechenegs"). And the demonstrative pronoun, as attentive readers would remember, especially those familiar with my book English Grammar Untangled, is the definite article, a tautological part of speech. So, all that huge number of nouns ending in "ag"/"ak" in all languages, starting with Georgian, are words ending in the article. Today, words in the Basque language, as well as in Romanian and Bulgarian, end in the article. But more importantly, according to Klimov, words in the Kartvelian languages also used to end in the demonstrative pronoun (that is, the definite article) "-a".
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