User blog comment:CureHibiki/Kira Kira Pretty Cure!???/@comment-6011846-20161022055809/@comment-25034020-20161022061623

Like, Hikari can be the surname but not the first name. It's like how Kurumi was repeated again to be Erika's surname. So if we happen to get a space theme, Toei might reuse "Hikari" but as a surname. So "Hikari ???".