Safer is a mistranslation of Sepher. See the translation project at my forum.
I like "Safer" more than "Sepher". "Sephiroth" and his american pronounciation reminds me of "Sepher" well enough. And "Safer" is quite fitting. But vor Bizarro Sephiroth I like "Rebirth Sephiroth" more than "Reverse Sephiroth".