Nope, I wouldn't do it. If I was forced to do it, though, I guess Sara (FFs I, III), Maria (FFs II, VI), Jessie (FFVII), Tina (FFVI) and Vincent (FFVII) could do. Maybe Lenna (FFV) and Rosa (FFIV) too.

Oh, and naming your child Sephiroth isn't as bad as naming him Exdeath or X-Death.