How to hide the last name and first name?

Hello,

Sometimes, we can see the last name and first name when it should be the pseudo of the user.

- Example 1 : when you want to search a user
pseudo = tic
you see the reals last name and first name

- Example 2 : the reals last name and first name appear when someone writes an article

- Example 3 : the reals last name and first name appear when someone comments an article

Thanks a lot