Suppose there are two users commented on an answer. Both have same name. And, I want to reply to one of them. How can I do this? Is there suffix etc to attach with @name for this?

Update:
From http://meta.stackoverflow.com/questions/43019/how-do-comment-replies-work , specifically: 4. Matching is performed in reverse chronological order, so if five people named John are participating, @john will match the most recent John, its clear that I can't do this.

So, it's a request to add this feature using -n suffix or something similar. e.g.- @john-2 could be used to reply second John from top.