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I need ideas for naming all girl triplets, who are all secretly sirens/mermaids.

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So I need some ideas for their names but have a few requirements:
1) I wouldn't mind them all having the same initial (for example I love Cordelia and Coraline but can't figure out the third to go with those) but I'm against two of them sharing the initial letter and the third being the odd one out
1.5) The same initial isn't mandatory but I would like the names to share smth similar for example double letters or the same ending letter like y
2) For themes I would like ocean/sea/river/lake basically anything water-themed or another theme like gems, or perhaps names meaning beautiful but they should all somehow connect

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Also, the names should all be the same length or noticeably different in length (for example Elly, Lizzy, Bettsy)