Hello koko,
I found two arabic speaking neurologists but none of them are in Neukölln... here are the contacts information, in case there is no better answer :)
Dr.med. Jad Lukian Jiko
Tel.: 030/42801800 
Hufelandstr. 31
Pankow/Prenzlauer Berg    
Dr.med. Said Masri
Tel.: 030/7513632 
Tempelhofer Damm 227
Tempelhof-Schöneberg/Tempelhof