[Konstantinos]

You store the name in a variable and use the variable to print it.

pawn Код:

new 
    pname[ MAX_PLAYER_NAME ]
;
GetPlayerName(playerid, pname, MAX_PLAYER_NAME);

// blablabla..

format(String, sizeof(String), "%s has used command %s", pname, command);
SendClientMessage(i, blue, String);