well, that is not considered as impersonating. Since ' Aaron ' is a formal name and there could be many other people around the world with this name. Impersonating is when someone uses full ingame nick of someone.
Likewise, previously i used my nickname as ' Asadullah / [ZA]Asadullah ' in game which is my real name. Its not only my name but millions of people around the world. They can use their nick in game as well.. Such as there are 2-3 kelvins.
Although my current nickname ' Decent_946 / [UF]Decent_946 ' is NOT Formal and i have a particular reason behind using this nickname for me. Hence, somebody else joining with this nick even without clan tag would be considered as impersonater. But if he just chooses nick ' Decent ' - again, this won't be impersonating.
This is same as this case:
https://ec.vc-mp.co.uk/index.php?topic=6176.0Locked.