Whoops, missed this one the first time through. I think herein lies the answer. The word that was imported into English and was once pronounced "kil" in Dutch must have in the last 200 years or so changed to "fil"

This link has an answer to this very same question. It doesn't mention "fil" though.

http://www.takeourword.com/Issue014.html

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...And that, my liege, is how we know the Earth to be banana-shaped. --Sir Bedevere