Kira means "dark lady" in Celtic origins and "glitter" in Japanese origins. Her last name, Sakka, means "soccer" in Japanese. Sakka could also mean "writing songs or poems" or "poem".
Kira is based on a Japanese Comic/Manga called Death Note.
Death Note is a Japanese Comic or manga that portrays the twisted and suspenseful story of Yamagi Light, a genius who gets his ambitious hands on the Notebook of Death. Upon writing a persons name and the cause of death within its pages the person will die 40 seconds later. However, Light has to overcome the police and super sleuth "L" who pursue him before he can "cleanse the earth" of filth.