She became "Bee" first of all (Whites says "well, we could hardly call her 'Blee', could we?"), and after Lance said "Bee, honey?" a few times, well... it stuck.
Disclaimer: Lance has no idea what honey is - or bees, for that matter - even though Whitesides tried to explain. Essentially, he knows honey = affectionate diminutive sometimes used by humans, and bee = small, busy insect, and felt like both were appropriate.
I'm reasonably pleased that she looks somewhat human, even though her anatomy is, ah, wonky? The wings are just me playing along with a theme.