Hi
I found this page which I think you would like to read even though it is concerned with Kilby as a surname, but it is an interesting page:
http://homepages.rootsweb.com/~kilbyhr/origins.html
Kilby a first name seems to be of Teutonic origin. I am not really sure what it means and since my best guess is unpleasent I will hold my tongue for now.
Yet, the Kabalarians have an article on this Teutonic name:
http://www.kabalarians.com/male/kilby.htm
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Selwyn