My intention is that it's treated, between them, as no more a big revelation than, say, an old tattoo, or a scar. She's surprised, sure. But he's the kind of man who knows exactly who he is, what his purpose in life is, what he believes in, and the MC needs no more explanation from him about it. (As a bit of background, this takes place in a universe in which the human race is tentatively supporting a 'we're all human' philosophy as a reaction against the cyborg population.)
Funny thing is, I actually thought the name was male before someone pointed out Dagny Taggart

Changing it isn't really an issue, though - I've got the name Damien on backup.