re the 747-400, it's surprising you're not confused. The surge tanks are not for holding useable fuel, so there are effectively only 3 tanks per wing. In fact, if fuel accidentally gets into the surge tanks on the ground, automatic refuelling is shut down.
The Centre Wing Tank (CWT) is between the wings. Optionally, there is one or even two Auxilliary Tanks fitted in the forward cargo on 747-400ER aircraft. However, I'm only aware of aircraft fitted with one Auxilliary Tank. There are extra "pump" switches on the fuel control panel in the cockpit for these tanks.
The Horizontal Stabiliser Tank (HST) is practically one tank which spans almost the whole stabiliser (including the hidden part in the fuselage) and is normally fitted to passenger aircraft. There is a surge tank in the horizontal stabiliser (on the right hand side).
The 777 normally has 3 tanks for holding fuel. Additionally, there are surge tanks outboard of each wing tank (which are not used for fuel storage). (EDIT) There are references to an Auxilliary Fuel Tank in the aft cargo area in some online documents.