Under Ninja - Vol. 10 Ch. 88 - According To The Surviving Shirunin

[soidish]

In later chapter her friends refer to her as Hime-chan so I think it's her real name.

Spoiler

It's going to be awkward if they refer to her as Missus-chan in this scene

But I thought she was killed by Igarashi

 

[Chroniclad]

But I thought she was killed by Igarashi

Spoiler

Her friends from the academy have grudge toward Igarashi for killing her so they mentioned her name to him.