Rio 1

Update: As of May 30th 2020, this name is now Unisex.
https://www.behindthename.com/names/history.php?name=rio-1

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According to the USA Social Security Administration, 44 girls and 34 boys were recorded with the name Rio in 1992.
https://www.names.org/n/rio/about
https://www.nancy.cc/baby-name/rio/

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According to the Office for National Statistics census of England and Wales, 59 girls and 26 boys were recorded with the name Rio in 1997.
https://www.behindthename.com/name/rio-1/top/england-wales
https://names.darkgreener.com/#rio

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There's also a Female character in Duran Duran's song: Rio (This song is about a woman called Rio who dances in the sand).
https://en.wikipedia.org/wiki/Rio_(song)
https://www.youtube.com/watch?v=V-qYYZrky1Y
https://www.youtube.com/watch?v=WOc4pvBNLcM
https://www.azlyrics.com/lyrics/duranduran/Rio.html

The name Rio was given to 103 boys born in the US in 2015.

Rio is a man's name? Well Duran Duran's famous song "Rio" was about a woman called Rio ("Her name is Rio and she dances in the sand...."). So can it be a girls name.