I definitely agree that in recipe books, the “traditional” ice cream is called Philadelphia style. How’s that? 
I had to Google. They went camping together!
Ding ding!
I gave up and Wikied – they all have Christmas birthdays. (Good thing I checked – I’d still be stuck if I was working with the only Dido I knew, the mythology one.)
Well, if that’s the only one you knew, then you’ve led a blessed life.
Sigmund Freud
Edgar Allan Poe
Sonny Liston
The common link has nothing to do with the way any of them died.
Correct! Quite a crew.
Try these three:
Henry Fonda
Brendan Frasier
Sam Waterston
Charles G. Leland
Jimi Hendrix
Cher
There are still a couple of older ones still pending:
Cite?
Hydrated silica
Pensacola
October
Freud and Poe both married their cousins – can’t find anything on Liston’s wife, though.
You got it. I intentionally picked three female singers in an attempt to trick people into looking for some musical connection.
How about some easier ones?
Jacob Marley
Rebecca de Winter
Hamlet’s father
The Last Tycoon
The First Four Years
The Mystery of Edwin Drood
Ghosts - or people who haunted the story’s protagonist. (Rebecca didn’t actually appear as a ghost, did she?)
Famous unfinished novels.
Not exactly what I was going for, but close enough.
I’ll spoiler what I was going for in case anyone else wants to guess:
characters who were dead before the story starts
How about:
Great Expectations
A Clockwork Orange
“Blade Runner”
Don Quixote
The Princess Bride
Eaters of the Dead
One I know without having to look it up, though I fear I’m going for the “too obvious” connection:
All were based on Novels, though the last one changed the name. (Though, DADOES has been rereleased under the Blade Runner name now.)
Blade Runner, it looks like there was some ambiguity, so I’ll clarify:
Great Expectations–novel
A Clockwork Orange–novel
“Blade Runner”–movie
Jesus, I called Hoopy Frood “Blade Runner.” I’m losing my mind!