Mar

Mar is also sometimes used as a masculine independent given name in Spanish and Catalan, meaning "sea" in said languages. However, Mar is more common for females. So, I think that the "Gender" of this name should be changed from "Feminine" to "Feminine & Masculine".

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Sources: https://forebears.io/forenames/mar
https://www.names.org/n/mar/about
https://babynames.com/name/Mar

Also Galician: http://www.ige.eu/igebdt/esq.jsp?idioma=gl&ruta=onomast/nomes.jsp
https://gl.wikipedia.org/wiki/Lista_de_nomes_femininos_en_galego#I