Ai 1

Ai 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 Ai is also used as a name element in unisex and masculine Japanese names such as Aio, Aisuke, Aihito, Aihitoshi, and Aihiko.

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Sources: https://en.m.wikipedia.org/wiki/Ai_(given_name)
https://forebears.io/forenames/ai
https://forebears.io/x/forenames/aio
https://forebears.io/x/forenames/aisuke
https://forebears.io/x/forenames/aihitoshi
https://forebears.io/x/forenames/aihiko

God, Ai is just so overused.. maybe use something else like Ren or Mana if you want a child named after love.

Ai was one of the most common Japanese girls names in the 1980s and 1990s.

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It entered the top 10 in 1978. It reached #1 in 1983 and stayed at the top of the list until 1990. It last made the top 10 in 2006.

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It is most commonly spelled 愛 (love).

Also a male name.

Ai was given to 6 girls in America in 2016.

This name is currently the most popular name for girls in Japan in terms of kanji. (source: http://5go.biz/sei/cgi/ninki2.htm).

Ai, using the kanji 愛, is in 9th place out of 1000 in 2014 while the one with 藍 is in 127th place. So, the one with 愛 is really popular now and has been for the last 35-40 years.

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Popularity sources: http://5go.biz/sei/cgi/ninki2.htm and http://coreblog.org/naming/fp/ranking/year_1970.html.