Kai 1

Also Basque:

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https://www.euskaltzaindia.eus/index.php?option=com_ecoeoda&task=izenaIkusi&Itemid=&lang=es&kodea=1368&mota=izenak

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https://www.behindthename.com/name/kai-1/top/basque_country

This is probably the closest thing to a "universal" name we have. It's gender-neutral and has been used in more than one culture. Not every culture of course, but I still find it interesting that it's found in Europe, China, and even Hawaii.

Noted the post about Trump’s granddaughter being named Kai Madison. In 2017, the names Kai and Kye were given to 3, 426 men (3, 121 and 305, respectively) in the US. Consequently, in 2017 (like 2016 and every year prior), it is once again overwhelmingly a male name in the US at 92% and exclusively male across the rest of the western world where it continues to rank in the top 100 male names in countries like Australia, England, Canada, Scotland, the Netherlands, Wales, and Germany, among others. Not a good idea to put this name on a girl, especially because it brings up images of a big middle aged German or Norwegian guy.

As far as I know, "Kai" is the Scandinavian short form of "Katharina". However, here in Germany where I live, it's used as a boy's name.