Annie's just going to stare at him for a while... and elsewhere in my brain where I've tucked Eight for the moment will just be facepalming and saying "Really, you could have just said 'I'm also called Eleven."
Unless there's a group of you together and she may call you Eleven, but "the one with the tweed and the bowtie" is a bit of a mouthful, and she'd feel silly saying "Bowtie-san" while not being Japanese.
Here, have this. It won't make a good emote, but whatever.