Adobe Reader

Apart from reading PDFs, you can also add comments in several types (e.g. add text, highlight, underline).

Change name in comments

• By default, your login name will be used for comments. You can modify comments one-by-one by editing, but you can also make a different name as default.
• See: http://acrobatninja.blogspot.hu/2012/11/comment-identity-in-acrobat.html
• Turn of "use login name as name always in comments" in Preferences, edit a comment and set your desired commenter name, right-click on a Comment (bubble) and select "use properties as default".