From Kubo-sensei himself! In a recent interview from the American Shonen Jump.
SJ: What does Rukia’s name mean, and why is it written in katakana?
Kubo-sensei: “When I’m working, I jot down names in the margins of my notebook as they come to me. Once on TV, I saw the original type of cosmos in South America…”
SJ: You mean, the flower?
Kubo-sensei: “Yes. The show mentioned the name of the flower in Latin or something-like “rukia.” It sounded like “Kuchiki Rukia” to me, and I wrote this down. When I created the character, I thought Kuchiki really fit as a Soul Reaper (Shinigami) name and called her Kuchiki Rukia. She had her full name from the very beginning. Later on, I learned that the word “rukia” means “light.” She’s like a ray of light for Ichigo, which makes the name really suit her.“
SJ: Do you have any plans to make Ichigo and Rukia a couple?
Kubo-sensei: “I’m not going to confirm nor deny that.“ [Laughs]
Where is your interviews about your precious ship?
RT @ tiger_haruko2: “I’ve also been planning to buy an i-phone all this week! :3 By the way, if we go with a black x orange Ichigo, what colour would Orihime be?”
@ tite_kubo: “Orihime, eh? I wonder. Would she not be something like light pink? As for Rukia, though, for her I’d go with violet and white.”