If EOM is I agree but where does the "O" come from? Omar mayhaps?
The words "Ob" and Bin in arabic I think usually refer to "From" and "Son of".
Much like we refer to Jesus of Nazareth, he would be referred to as Emer Ob El-Maati or Amer Bin El-Maati.
Not sure though, but I have heard on other boards that people are suggesting that this man has identified himself to someone as EOM/El-Maati.