I heard it on a show that I watch; it's the name of one of the main characters, a human/bubblegum hybrid princess.
I think it's cute, and she's my favorite character. I would never use the name on a person, but I think it would be precious on a pet bunny or rat.
I heard that Bonnibel means "beautiful" in Scottish, and an unreliable baby name website says that it's a variant of
Bonnie, which both make sense. Apparently it's also a kind of shoe, which I don't really care about.
WDYT? Do you have any additional info on it/can you clarify the info above?