Does Connor have a last name? If yes what is it?

I don't consider it his legal name because that is only his alternate reality and not the true reality he origings from and actually belongs to.

It isn't an alternate reality. W&H performed a spell that changed the worlds memories. It's similiar to Dawn's situation. Even though he wasn't always a member of the Reilly family, he is now. After his original memories were returned, he back with his family and still continued on with his new life. By all legal stand points, his name is Reilly.

Finaly I'm watching season 5 of Angel. It is an alternate reality. Even Angel says so in one episode to Cordelia: "The senior partners _altered reality_". Hence, an original is changed but the original nonetheless happened and still exsists in history, there's just this new version covering it. And my point was that I don't consider Reilly his legal name because that life is made-up by magic, a memory hoccus poccus and not a life he was actually born to and grown up in, and because.he doesn't belong to that alternate reality - if he did they wouldnt' have needed to return his original memories. I think "legal name" wasn't the best choice but I think I made my point clearer now. Anyway, I think this question is asking about Connor's original last name by his true father, Angel. I don't think the writers ever decided Liam/Angel's last name?

If it was an alternate reality, wouldn't Connor genuinely be the Reilly family's son so he'd have lost his half-vampiric qualities? I thought it was reality alteration myself when I first watched, but the fact that he healed in Origins made me believe it'd been a huge memory altering spell instead.