What was Esau's real name?

 Esau's name will probably be difficult because of how we write today.

According to Genesis 25: 26 it reads thus: The first to come out was red, and his whole body was like a hairy garment, so they named him Esau.

A red person or rather light-skinned person is called Mosweu in seTswana

So it is possible that if they used the skin colour, he was called Mosweu. So how did Esau come about. In Paleo Hebrew Esau is written as Esaw. Mosweu and Esaw have three common letters - those are ESW. Clearly MO was dropped first. When you drop Mo from Mosweu you'd be left with Sweu. From Sweu take E to the beginning and get ESWU. Lastly change U to A and then move it to between S and W to get ESAW. Esau and Mosweu do rhyme and you can tell right there that it is a Bantu language.

So conclusion is Esau/Esaw was Mosweu in SeTswana.