Kalia and Malia
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I think they're way too close for siblings. Kalia Eleni's all right.
Pretty horrible! My DH's grandmother had two cousins called Alie and Malie who, poor women, have been family jokes for decades. But in real life Kalia and Malia, like Alie and Malie, would be funny rather than ... anything else: dignified, beautiful, exotic, whatever.