Mei 2

Mei 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". Some evidence for this is that Mei is also used as a name element in unisex and masculine Japanese names such as Meisuke, Meihitoshi, and Meihiko.

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Sources: https://forebears.io/forenames/mei
https://forebears.io/x/forenames/meisuke
https://forebears.io/x/forenames/meihitoshi
https://forebears.io/x/forenames/meihiko

Mei was the 4th most popular girl's name (by reading) in Japan in 2018.