Kainoa

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Origin: Hawaiian

Meaning: a Hawaiian unisex name meaning "the namesake" from ka (the) and inoa (namesake, namesake).

I've also seen it listed as being composed of kai (sea) and noa (free of taboo; a commoner) though whether that interpretation is a legitimate one I don't know.

Although I've seen it listed as a unisex name, Kainoa seems to be more popular for boys than girls.