She tells them her name after Pablo and Kelly catch up with Ash at the cabin and they all meet up, I think, before Ash chops up Amanda.
They actually reestablished that this version of Ruby's been doing that in episode 5, even though we knew that fact and none of it's really informed her character.
This is going to be my lamentation forever, especially because there was so much free plot real estate that could've been developed using this idea that got wasted with Linda B/the sheriff/Lacey last season. A lot of this was probably due to Craig's plan to make the kid Kelly and put Linda B in the role that the KOS is filling.
And it's SO EASY to fix the show in hindsight with these characters on deck. Like: Have Ash as an average workaday schmoe, happy with his lot in life, still living with his scars (he dates around, but keeps the memory of Linda paramount in his mind) working at S-Mart/Value Stop with Kelly and Pablo. He gets a legal notice, and it turns out the daughter he's been supporting from a distance (poorly; maybe he sees her once a year, maybe his financial support means he can only give his ex a couple of hundred a month) needs a guardian, because his ex-wife's died tragically/suddenly of an illness. He drives back to his hometown and finds Brandy in the care of Ruby, who's working undercover for the state and has already established a rappaport with Brandy. Ash takes Brandy home with him (Maybe a freshly-retired Brock arrives determined to look after the kid because he thinks his son'd be a lousy dad) but she has a bad time fitting in and adjusting. Determined to prove her coolness to her peers, she finds the Nec among Ash's things and reads a passage out loud, awakening the evil. Ash and Brandy flee in the motor home, dragging along Pablo (who's been denying his brujo heritage in an attempt at Americanizing himself) and Kelly (who, heck, let's go with it, has been training with the Knights of Sumeria since she was a teenager because her parents died. She thought they were just doomsday preppers!) with Ruby in pursuit because she doesn't want Ash to hurt Brandy the way he hurt/killed her sister (if you want her to be good) or because she needs Brandy to dethrone Ash and rule the world (if you want her to be bad). Oh well.
ETA: apparently Episode 8 was writer Bryan Hill's first attempt at writing for a series and he's been very grateful for the positive reviews this has gotten on Twitter. I thought that was nice!