Surnames?

That's why I find it so funny that Penny told Piper that Halliwell women keep their maiden name when SHE didn't! To our knowledge the only Halliwell matriarchs are Penny, Patty and Piper. Not a lot of power when the Charmed Ones called on them. They should've called on the Warren witches to get rid of the Source and welcome new babies into the family.

And if you actually stick to the canon, Penny was *never* a Halliwell because Patty didn't become one until she married Victor Halliwell, as the opening credits proclaimed in 'Thank You for Not Morphing', so as you said unless the original Charmed Ones' last name was Johnson... Truly, if Penny was really telling the truth, Charlotte and Melinda Warren's names should've been Charlotte Halliwell and Melinda Halliwell. Impossible in Season One when Victor's name was Victor Halliwell so it should've been impossible in the Charmedverse.

To top it off, not only was Penny's maiden name Johnson, but her mother's maiden name was Baxter, so not even her mother kept her maiden name.

It all says that Penny was lying, and Piper should've known better and had the option of becoming Piper Wyatt or even Piper Halliwell-Wyatt, either of which I think she would've preferred.

I've always thought that Brad Kern screwed with the surname canon by using a different actor to played Victor with a totally different name leading to Halliwell women supposedly keeping their maiden names because he was already thinking of a child named Wyatt Halliwell who would be half-whitelighter and have a prophecy of his own making him even more powerful than the three most powerful witches the world had ever known all by himself rather than be a daughter named Melinda Wyatt or Melinda Halliwell-Wyatt.

Like we keeps saying - Inconsistency, your name is definitely Charmed!