I do like the name
Tempest, though it makes me think of the girl (I think her name was
Tempest Smith, and I'm pretty sure she was from Florida) who killed herself after being bullied by her class for dressing goth and being into a Pagan religion.
With
Patience, I do not think
Tempest would fit in-makes one sound like the "good" sister, and the other like the "bad" sister. She seems to fit in with with Aleydis and
Freya, but with
Arthur ( a nice, solid, old-fashioned choice), it sounds a little far out there.