Originally posted by some guy who made this FAQ.
This must be intentional. Sephiroth is a Hebrew word, which derives from the Cabbala, a branch of religious lore that has its roots in Jewish mysticism. It states that at the creation, God sent a pulse of energy out into the void; this branched into ten aspects or spheres, numbered 1-10. The Sephiroth. To return to God, a Cabbalist must conquer each of the Sephiroth. (I realise this is a massive over-simplification, I advise you enter Sephiroth as a search term in Google. You'll get one set of results relating to FF7 and another related to Cabbalism).