[Merlin's managed to keep his cool through most of this, but that question catches him off-guard entirely. There might even be a faint hint of pink in his cheeks.]

The only other person who knows my name is Harry, and it took him years to get it out of me. But I think I can make an exception, if you promise not to laugh.

[a long pause] My name is Angus. But honestly, Merlin feels more like my real name to me than anything else now.