I see a few names on this thread that I'm also considering!
Here are the current lists...
Middle name options so far for girls: Casseopeia, Lyra, Andromeda, or Sky
Middle name options for boys: Leo... that's it. We already used Orion and Phoenix, so that one's harder!
We're trying to avoid names starting with the "K" sound, if possible, because my husband and I both have names starting with that, or "L" and "J" because of the older kids. But I'd make an exception for Cameron possibly. We also need to avoid anything that ends in "s" because our last name does. It's hard. I didn't realize how many boy names I liked that end in "s"! Ennis, Lucas, Jonas... and I loved Sirius as a possible middle name. I just had to very sadly remove Tobias from my list when I realized my mistake. Duh!