Here’s one (not necessarily easy, but one that’s easily inferred!):
Matsuo Takahashi
Arnold. Another one from Happy Days.
I am John Drake.
. . . or am I?
No one else going to answer? One of my favorite TV shows.
Number 6.
Poor, poor Screech (Saved by the Bell).
My name is Elsie Ethrington
RE Gordon Shumway as Alf’s name- was there some tie-in/in-joke with Mary Hartman there. I knew Shumway was her maiden name & actually I thought Gordon may have been The Fernwood Flasher/Grandpa’s name.
Correct, Thalion.
astorian, from your list:
Jerome Kuhner-Chaim
WAG - could this be Stretch Cunningham? I know that Archie Bunker was surprised to find out Stretch was Jewish; was this given as his name at the funeral?
I have no answers, but I couldn’t resist tossing one out:
Richard Stabone
total belated hijack, but I don’t think Judge Synder’s order can really be extended as far as applying to us viewers. 
Just Springfield residents who were present when he made the announcement, which was pretty much the whole town.
Of course, Lisa’s broken it by now. But then, who could be so hard-hearted as to torture Lisa Simpson?
Terence Aloysius Mahoney (or Terence Montgomery Mahoney)
Horace Debussey Jones
Forsythe P. Jones (extra credit: What’s the “P” for?)
Edward Nigma
Jughead (from Archie; I don’t know the “P”) and The Riddler (from Batman).
Here’s a few more:
Hunter Hearst Helmsley.
Eric Lehnsherr.
Vic Sage.
Shayera Thal.
Greg Saunders.
Mari McCabe.
Oh, come on. Comic book costumed superheroes and villians – that’s cheating.
Francis Ethelbert Sharkey = Chief Sharkey from “Voyage to the Bottom of the Sea” (C.P.O. Sharkey’s first name was “Otto”)
George Stevens = Kingfish from “Amos ‘n’ Andy”
Homer Deegan = Speed from “The Odd Couple”
Jane Angelica Thrift = Jane from “F Troop”
Eric Lehnsherr = Magneto
Shayera Thal = Hawkgirl/Hawkwoman (Mark III). The Golden Age Hawgirl was Shiera Sanders-Hall; the Silver Age one was Shayera Hol.
They have all had multiple appearances on TV shows, though.
Eric Stratton
Daniel Day
Donald Shoenstein
Thomas Hewett Edwards Cat
Yeah, but the secret identity is part of the concept of a costumed superhero and his or her foes. Nearly every appearance shows: see this guy is really this guy. It’s not as interesting as a character who didn’t have a secret identity whose real name just is not well known.
George Gates
James Logan
Vic Sage = The Question
James Logan = Wolverine?