Just an UX idea which American developers never think of. But, this can be a big issue too.
In many Asian countries, the order of one's name is different from the US or EU. For example, we use <Family Name> <Last Name> order in Japan.
In ArcGIS Online and Portal for ArcGIS, the profile name displayed can't change the order. We normally don't use the last name when we call somebody at our work place, and it makes ArcGIS Online and Portal for ArcGIS very odd system.
It'll be nice to have the function to change the name order or to select which field is displayed.
This can be solved by our workflow, so just an idea that Esri can think a bit for international users.