User blog comment:Emeliya7/transformation names/@comment-31892545-20170720162843/@comment-31892545-20170720165512

Because "Winx" ends in "-ix". That's really what sets Winx Club apart from other "magical girl" series" - the distinction between a just a power-up you normally seen in those kinds of series or those from Winx Club. The "-ix" is iconic, and anything else this late in the series wouldn't bode well for it.