Cleo

Also German:

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https://www.beliebte-vornamen.de/37475-cleo.htm
https://www.behindthename.com/name/cleo/top/germany-berlin
https://de.m.wikipedia.org/wiki/Cleo
https://de.m.wikipedia.org/wiki/Cleo_Steinberger
https://de.m.wikipedia.org/wiki/Cleo_Kretschmer
https://de.m.wikipedia.org/wiki/Cleo-Johanna_Budde

Also Swedish: https://www.nordicnames.de/wiki/Cleo

Also Provençal: https://ieo-oc.org/spip.php?page=article&id_article=290 --- Source: Institut d'Estudis Occitans

Cleo is not a traditional masculine name, its usage on males arose in the 18th-century in the U.S. due to ignorance, people assuming that since it ends in an -O, it must be a masculine name. This is one of the few traditional female names that was stolen for boys.

In 2018, 86 is the most common age for an American (U.S.) Cleo* who is registered female with the Social Security Administration. It is the 1752nd most common female first name for living U.S. citizens.

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*as a first name, not a nickname.

Cleo is also used in France. [noted -ed]

Cleo isn't just a feminine name, it should be changed to Feminine and Masculine, in fact my grandpa's name was Cleo.

The name Cleo was given to 118 girls born in the US in 2015.

I think the name Cleo can be used on a boy.

The name Cleo was given to 119 baby girls born in the US in 2012. It's a nice, quirky, unique name that should age well and is in my opinion a great alternative to the way too popular Chloe.

This name could be male, because it was my great-grandfather's middle name. It was going to be my sister's name, too, in honour of him, but she was stillborn.