I think it's called "Clara".

(I am just typing this out to justify how much Jenna loves Peter, I am not degrading any of Jenna’s relationships with her co-stars in Victoria) So I watched clips of Jenna’s live Facebook Q&A, and when someone asked “What was your favorite thing during filming Victoria?”, Jenna replied, playing Victoria herself. Remember when they asked the same thing to Peter and Jenna last year in Comic Con, and Jenna replied with “I was just gonna say how much I love Peter Capaldi”