Rei

Also a name for males.

Rei is also used as a masculine name in Japanese. However, it's more common for females. So, I think that the "Gender" of this name should be changed from "Feminine" to "Feminine & Masculine". For evidence of Rei also being used as a masculine name, see comments below this one.

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Sources: https://en.m.wikipedia.org/wiki/Unisex_name
https://forebears.io/forenames/rei (I think)
https://en.m.wikipedia.org/wiki/Rei_(given_name)

Sometimes I've seen this used as a nickname for Rebecca, or a variant of Rae.

Very common male name in Japan. (http://5go.biz/sei/cgi/ninki1.htm).

Rei was also used a boy's name in Ancient Japan (aka Nippon).