I'm not sure about Kisara. It seems kind of contrived to me, like someone went, "I need a name with "kiss" in it!" and came up with Kisara. I have no idea if it's legit in any language or not, though. I love, love, love
Alec, as a full name or as a nickname.
Justina is all right, I prefer
Justine. I think the sibset is quite nice, only Kisara sticks out a bit.