[[HiC]TheKiller]

You could always do the casual strcmp

pawn Код:

CMD:mycommand(playerid, params)
{
    new pname[24];
    GetPlayerName(playerid, pname, 24);
    if(strcmp(pname, "Fernando", true)) return SendClientMessage(playerid, -1, "Only Fernando can use this command!");
    //Command
    return 1;
}

EDIT: Looks like RACGaming beat me to it.