[ptx]

Python, Kotlin and C# all support named arguments, and they're pretty popular languages. And also... there's Visual Basic.

[Okawari]

I guess you can add dart and maybe ruby and elixir if you accept that they treated as a map/keyword list on the receiving end of the function.

Edit: Ruby apparently made them first class citizens back in 2014. Ive been oblivious to this for years... wow.