Marnie

A diminutive of Marina, the feminine form of Marinus, which comes from Marius, the masculine form of Maria, a variant of Mary, which derives from the Hebrew name Miriam (מרים) meaning “sea of bitterness”. Miriam comes from two Hebrew words: mar (מר) means bitter, and yam (ים) means sea.

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Anyway, Marnie means “sea of bitterness” or “of the sea”. A beautiful name.

I've always heard it means "of the sea".