There is a stock provided by GoD-Tony you could implement into a new plugin that works - at least until the map is changed (unless you use another method to actively change the name back to what you want it after map change).
the sm_rename command shipped in SM doesn't work for CS:S - the game just changes the name right back to what the user had - but with the stock mentioned above, you could psuedo'ly change the players name.
Here you go - here's the include GoD-Tony provided:
PHP Code:
/**
* Changes a clients name
*
* @param client A client index.
* @param name Set to false to skip the IsClientConnected check
* @param silent Set to true to not broadcast the name change
* @noreturn
*/
stock CS_SetClientName(client, const String:name[], bool:silent=false)
{
decl String:oldname[MAX_NAME_LENGTH];
GetClientName(client, oldname, sizeof(oldname));
SetClientInfo(client, "name", name);
SetEntPropString(client, Prop_Data, "m_szNetname", name);
new Handle:event = CreateEvent("player_changename");
if (event != INVALID_HANDLE)
{
SetEventInt(event, "userid", GetClientUserId(client));
SetEventString(event, "oldname", oldname);
SetEventString(event, "newname", name);
FireEvent(event);
}
if (silent)
return;
new Handle:msg = StartMessageAll("SayText2");
if (msg != INVALID_HANDLE)
{
BfWriteByte(msg, client);
BfWriteByte(msg, true);
BfWriteString(msg, "Cstrike_Name_Change");
BfWriteString(msg, oldname);
BfWriteString(msg, name);
EndMessage();
}
}