once i looked into a book at my school library (perhaps about angels) and found this interesting piece on Sephiroth. i even was amused enough to photo-copy it, but i'm not adding an attachment. however, i did find this:

http://www.britannica.com/eb/article?tocId=9066586

sefira does sound a little like Seifer, depending on how some may interpret it. just so you may like to know .