This Shabbat we were away in Tel Aviv (more about that in future posts G-d willing,) so I wasn't at my weekly Torah Class and didn't get to remind everyone what Moshe Rabbeinu
Of course, I'm projecting my own feelings and experience, but I think that Moses had a princely Egyptian accent and knew that the Jewish slaves wouldn't accept him as their leader because of it. To fit into the royal household he was probably given elocution lessons to erase the accent he picked up at the "Jewish wetnurse's" home, his biological family.
There are lots of very respectable Jewish commentaries saying how the Jewish People had kept language, names etc, and in the parsha we read that Yitro's daughters mistake Moshe for an Egyptian. It could be because of his accent!