Who actually named her Dagger?

[Jiro]

Bottle or Sieve or some equally weird name.

I can dig Sieve

I named her Dagger because I could not be bothered trying to think up a better alias. It also worked better when she cuts her hair an all that jazz. She's all like "can I have that dagger, you know the one" and it has less of an effect if they were like "how about THIS NAME INSTEAD K?"