If somebody has just one name in a culture where everybody has just one name, for example Javanese culture, is it still a mononym?

I remember when I was teaching a group of Javanese who were going off to the US to study. Of course all the forms wanted given name and surname, but they only had one name. In the end we just told them to put that name down for both, so that they ended up as Suhendra Suhendra or Dewi Dewi, or whatever.

Bingley

Bingley