User blog comment:Gcheung28/Ask Shantal Rhodes Teen Wolf Questions/@comment-72.184.176.11-20130716223247/@comment-4091815-20130718222019

Right - They're family - that's been established but do they all have the same last name?

Not once has anyone called her Cora Hale.

We had the same problem with Gerard - we actually just assumed the canon of his last name being Argent because he's Chris' dad.

no one has ever called him "Gerard Argent" or "Mr. Argent" on the show to my recollection.

Just as no one ever said "Erica Reyes" out loud on the show - we got her name from an insurance paper that her dad signed and from the missing poster.

She'll remain on this site as "Cora" until someone on the show says "Cora Hale" or we see it written down somewhere on screen.