OK - I JUST went through the exercise of getting Kontakt 5's names figured out on MY system. Your post reminded me how much of a PITA it has been for the longest time, because it was always a guessing game to get the right one.
Go to Utilities>Plug-in Manager and on the left side of the dialog window - under Plug-In Categories, choose VST Instruments. You will see the 3 Kontakt 5 flavors listed, with no clue as to which one has which number of outputs.
Click on the first Kontakt 5 of the 3 that are listed, and then click on Plug-in Properties (toward bottom of window center). This opens up the properties page for that dll. Here you can change the name, and to know which one of the Kontakt 5-s you are looking at, click on Details, and it will tell you the number of outputs.
I changed the names of all three Kontakt 5 VSTi instruments to:
Kontakt 5 - 08 Outs
Kontakt 5 - 16 Outs
Kontakt 5 - 64 Outs
This changes the displayed names, both in the Plug-in Manager displayed list, and in the list when you go to insert a Synth to the Synth Rack.
I hope that helps.
Also, since I pretty regularly have multiple instances of Kontakt inserted into the rack, I also rename each loaded instance to reflect something more meaningful than Kontakt 5 - 1, etc. I use names like Horns, Strings, etc., depending on what instruments are loaded into a given Kontakt 5 instance.
Here is the documentation link on renaming instance namer in the Synth Rack:
http://www.cakewalk.com/Documentation/default.aspx?Doc=SONAR%20X2&Lang=EN&Req=SoftSynths.10.html Bob Bone