[[J]ulian]

pawn Код:

new n[MAX_PLAYER_NAME], p;
        GetPlayerName(playerid, n, sizeof(n));
        p = strfind(n, "_", true, 0) || strfind(n, "hola", true, 0);
        if(p != -1)strdel(n, p, p+1);
        SetPlayerName(playerid, n);

Utilizando lo de chaoz y agregar mбs palabras calculo que asн serнa xD.