[RajatPawar]

pawn Код:

new allowed_names[][] = 
{
     "David_Johnson",
     "Melinda."
};

// Where you check
new name[ 24 ]; GetPlayerName(playerid, name , 24);
for( new i = 0; i < sizeof(allowed_names); i++ )
{
   if( strcmp( name, allowed_names[i], true) != -1)
   {
       // Allow names
   }
}