I can certify his first name is Amine and not el Amine and I know the player for about 6 years so please believe me . it's also a matter of logic . to make a short explanation "el" in arabic is just the same as "el" in spanish (example : el nino). it's the same as "the" in english or "le" in french . so you can have familly names with "le" like "le crom" or "le tallec" but you don't have first names like "le jean".
Rbati means citizen of Rabat wich is the capital of morocco and Erbati is what "el"+"rbati" becomes to make it easy to prononciate . it's the same rule for "echouafni" or "essabr" . amine is a very comon first name in morocco and in many arab countries and it means "trustworthy".
that's the story and to say something about the player I think it's a good recruit for Marseille .