Wouldn't it make more sense to drop the "k"? It's lowercase and attached to the name, which seems off. I think just "Henry" would make more sense.
Henryk > Henry?
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I assumed it's a mishmash of Henry and Hendrik. Doesnt really feel that out of place imo.
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Henryk is a polish name. Gameforge tried too hard to be creative when localizing the game. Henry would have been completely fine. There was no reason to change it.
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Well we can drop all formalities and call him Fatty.

Maybe they want the antagonist to have a name that strikes a vein, and they want it to have a bit of a posh twist?

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Well, somewhen in the game he gets called that (Fatty) one way or another, anyway... '3'