View Message

Katherine/Catherine is a popular enough name that I don't think that it would be an issue if you used it even though your kids have a cousin named Catherine, especially if it's only a middle name. For all people know, you could have easily named your daughter after someone else considering how many people there are named Katherine/Catherine.

---

Willow Katherine/Catherine is my favorite out of your combos. Isobel Katherine/Catherine is my second pick. I love Caroline, but Caroline Katherine/Catherine is too heavy on the hard C/K sounds.

---

I don't have a strong preference on the spelling, but I'm leaning towards Katherine as a middle name for Willow and Caroline. With Isobel, I prefer Catherine, though.

---