names on Duolingo

[AnnaHamilt12]

Why is it that when I click on "Students" to see all the students' names in my classroom, some have last names and some do not?? How do I go about fixing this problem? I have 4 Emma's, 3 Claire's, 2 Jonathan's and its driving me crazy!!!!

Is it possible for me to change their names on my screen?? How do I do that?

[pentaan]

Note:
It is very important that you keep all the student's names and user names anonymous (your own too).

Background information in:
Leaking data to facebook despite no facebook account?
https://forum.duolingo.com/comment/30212475