Cubheart came to Seagaze totally nameless and alone. Seagaze took her in giving her a name and a job as the Pack's scout. Cubheart fell into the role with ease as she relished in the adventure and being able to help the wolves that welcomed her in and gave her a name.
If asked Cubheart won't be able to tell where she comes from because she has no memory of it. She doesn't have any memory of a name or who she was before joining the pack. But she isn't in the slightest bit bothered because in her eyes she is home.