Cleo. I don't like sounds a like a cat, IMO Eliza is beautiful Arianna is okay. Xavier is beautiful, and goes great with Cancer Brodie and Harley. I can't stand , sorry. They're such daft names compared to a strong name like Xavier, apologies to anyone I may have offended. So my choice of names would be. Eliza or Xavier.
The girls names are all lovely, my favourite is Cleo.
I'm not keen on the boys names TBH, a bit American sounding to me. Harley also makes me think of motorbikes! If I had to pick one I'd go with Xavier, but I think it sounds a bit too 'match' with Xander.