You missed a couple neat blue names... Cobalt and Lapis. Cobalt is often used in ceramics to make blue glazes and Lapis is a very ancient substance used for jewelry and to make blue pigments.

Will you know the gender of the BTS? I think Lapis would be a great female name...but not so much for a male.

I've been considering getting a BTS myself, I'll be curious to follow how you do with yours.