The decryption is based on the name of the guy you met at the lowest level of the tanner's house: Vellin Dahn
However, even if you don't know that there's one sentence in the note that immediately gives it away considering the possibilities you get to choose from later.
Quote:
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The entire last of my first is the last of his first, except the first one of these is the first of my last.
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This states that the end of his first name (starting with the fourth letter) starts with the same letter as the last name.
So all you have to do now is look for a selectable name where this applies.
The only name with that feature is Dar
cin
Cole