I would totally believe these were three real-life sisters. That is... amazingly coherent!
The Katheryn spelling, while not my favorite, is certainly interesting, especially since it's how Katheryn Parr signed her name (though the textbooks all call her Catherine).
I've never personally been a fan of Margaret, but it has the same medieval / English Renaissance aura as Katheryn. And it goes with Greer.
Johannah is the most modern of the 3, but still believable. And I like Jojo (or just Jo).
I can only recall two "name dreams" I've had in my life. One was as a teenager, which began a years-long fascination with the name Clarissa: in it, Clarissa was the name of a... mountain. The lair of an evil warlock, basically; and it had a lake that could freeze your skin off. Yeah, great dream...
The other dream I can't even recall the context of, but the name I remembered was: Aline Minerva.
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