It also has potential as a kind of Stock trope - though I not exactly sure whether Stock pages are trivia or not - Jack is a fairly ubiquitous Stock Name in fiction, dating back decades if not centuries. Jack, John, Johnny, etc - that name is everywhere, and I feel kind of safe in assuming it's the most common name in fiction.
It's a fall back name, a symbolic name, a relgious name, a historical name, or just a name, and writers use it like it's going out of style.
edited 13th Sep '11 10:45:38 AM by KnownUnknown
"My final prayer: O my body, always make me a man who questions!" — Frantz Fanon
Looking only at the description (I didn't dare to brave the examples), it does look pretty bad. It basically boils down to "Jack is a common name in Anglo-Saxon fiction". And?
I have the hypothesis that Jack (and Jake) might be common names for an Action Hero, but I don't have enough examples to back it up. As it is, though, the trope seems nearly worthless to me.
It does not matter who I am. What matters is, who will you become? - motto of Omsk Bird
I've heard it suggested (in-universe, even) that Jack is a standard name for the plucky underdog type of hero (Jack and the Beanstalk, Jack the Giant-Killer). In Charles de Lint's Jack of Kinrowan, the name has mutated into a title for human heroes of this type among The Fair Folk (although the protagonist is a woman actually named Jackie).
Still, that doesn't seem to be this trope. But a trope similar to Alice Allusion about allusions to the Beanstalk/Giant-Killer character might be a valid trope. Captain Jack (any of the flavors shown) wouldn't fit that, though, I don't think.
The description seems to be getting at something with "Jack is a name for chaotic badasses" but the examples don't follow suit, it's just a list of people named Jack including Jack Dawson of Titanic. With Everythings Better With Bob it is about the use of the name Bob for comedic effect.