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ac is the old english term for oak
I have seen the name Aca, pronounced Eh-sa, given as reference to the name Ace, but this is of modern origin.
http://www.etymonline.com/index.php?term=oak

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Butta, likely from but 'goal or end' or butte 'a mound or knoll', both old french
http://www.etymonline.com/index.php?term=butt

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No ideas on Weorth, sorry.

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