Madeline: MAD-uh-lin (my first choice) or MAD-uh-lien (what I'd actually expect) Eunice: YOU-nis Kaya & Kaia: KIE-uh
Although Eunice (YOU-nis) is not a common name, it is a reasonably familiar one. I think you-NEES would come off as an affectation and would be a pain in the butt to enforce.
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