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I don't think they're particualarly rhymey. Certainly not on par with anything like Ada, Jada, and Maida. The -a/-ah is a little bit repetitive, but not problematic, overly matchy, or rhymey in my opinion. I think Ada, Clara, and Susannah would be perfect for sisters.

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Ethne is close enough to ethnic (visually) that I wouldn't use it. If I loved the name, I'd opt for Eithne instead.