Well, the German name book "Das große Vornamenlexikon" (Duden) does list Ilsabe as a German variant of Elisabeth. However, I just did a quick internet search on the name - and it seems to have been used predominantly in the North of Germany (think Hamburg, Lübeck, Baltic coast...) and I hardly found any Ilsabe born after the year 1800. (Most Ilsabe's listed were born some time between 1300 or 1400 and 1800, so the name seems to have fallen out of commen usage by that time.) Then again, as I said, it was a very superficial search, so of course I could be wrong.
This message was edited by the author on June 17, 2010 at 1:43:43 PM