Itchesrulik, Even among the Ancient Near East etymologists there is a big question mark whether the language that we might consider loshson hakodesh as well as the precursor language to ancient hebrew, phoenician, minoan and eventually greek transited west to east or east to west.
I think the evidence of Torah dictates east to west. That being said, the geography and demography of the Mediterranean basin made the spread of these related languages quicker and broader once seafarers began to use it across a larger area, so it might look like it spread from Crete, Greece, etc.
Also, the OP doesn’t know or realize that during the time when Yosef was in Mitzrayim (as he quotes the Ramban, I think about Yosef) Lower Egypt (the northern part) was being invaded and ruled by the Hyksos, a nation that came from the area of modern day Syria. They spoke a language that was related to early Hebrew and Phoenician.
As I said, the kedusha of a language depends on who is speaking or writing and what is being said. Think about this. Amalek, yemach shemom, lived not far from E’Y, were related by ancestry to us, and were also nomadic. Do you think they spoke a language related to Chinese? Finnish? Or was it something like all the other Edomite tribes spoke – which sounded a lot like what our ancestors spoke?