Display full name in comments instead of user name

Hello,

I am using Atahualpa 3.3.2. Is it possible to change the way the author name in comments in displayed?
Currently it shows e.g. "user1" (login name)
I would like to see the full name of the user who wrote the comment, e.g. "User One" (firstname lastname).

I saw that there are several author name options in the "Post/Page Info Items", but I couldn't find the right spot where to change it for comments.

Thanks in advance for help