Luz

Luz is also a Portuguese given name. Some evidence for this can be seen on the Popularity Chart for Luz for Portugal. And, Luz is used as a surname in both Spanish and Portuguese. So, I think that the "Usage" of this name should be updated to read, "Spanish, Portuguese".

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Sources: https://forebears.io/forenames/luz
https://www.ancestry.com/name-origin?surname=Luz

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#D

The name Luz was given to 263 girls born in the US in 2016.
More than 99.9 percent of people with the first name Luz are female.

It's also used in Portugal usually as Maria da Luz.