Akkadian is often mentioned via the names of its dialects Assyrian and Babylonian. Aramaic was once so entrenched as the language of note in the Middle East and beyond that it was the language of administration under the Persian Empire, run in Persia vastly eastward of where Aramaic had arisen, despite the native language of Persia’s rulers being, well, Persian, completely unrelated to Aramaic. It lives on today among small groups, termed, for one, Syriac. Akkadian had z, s, sh, ts, and an h sound that you made with your uvula. Aramaic at the time had sh, dz, ts, and h. Snaky sounds.
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