User blog comment:CureHibiki/Kira Kira Pretty Cure!???/@comment-9442368-20161022062224/@comment-25034020-20161022062540

And its also a little similar to how Doki Doki's title was...

Kira kira and Doki doki...both onomatopoeia's, Kirakira meaning something that shines and doki doki to do with my the sound of a beating heart. Well...kind of XD