I’ve liked [name_m]Jack[/name_m] for a good 10 years since I first saw the Pirates of the Caribbean movies and (especially) Titanic.
[name_m]Jack[/name_m] is quite popular right now, though I don’t mind that too much. However, I worry if it is seen as “trendy” or would be dated in years to come?
I would be more inclined to see [name_m]Jackson[/name_m]/[name_m]Jaxon[/name_m] as trendy/modern, while [name_m]Jack[/name_m] to me is more of a popular classic, but that’s just my biased opinion.
[name_m]How[/name_m] do you guys feel?
I’m the same as you. [name_m]Jack[/name_m] has been perennially popular, but [name_m]Jackson[/name_m] (and [name_m]Jaxon[/name_m], and the other spellings!) seem to have surged out of nowhere. [name_m]Jack[/name_m] still feels timeless, while [name_m]Jackson[/name_m] I’m already tired of. 
Agreeing. [name_m]Jack[/name_m] is a classic while [name_m]Jackson[/name_m] is modern, trendy, and overused.
[name_m]Jack[/name_m] is charming and classic, to me is a warm name. I agree with [name_m]Jackson[/name_m]/[name_m]Jaxon[/name_m] as modern names. However, I much prefer [name_m]Jackson[/name_m] over [name_m]Jaxon[/name_m]. [name_m]Jackson[/name_m] can be short to [name_m]Jack[/name_m], and the -son gives it a more american feeling ([name_f]IMO[/name_f]). To me, [name_m]Jack[/name_m] is a english name while [name_m]Jackson[/name_m] is more or the USA type.
[name_m]Jaxon[/name_m] is just a misspelling, although I have to admit I kinda like the spelling [name_m]Jax[/name_m], but I would use [name_m]Jackson[/name_m] as a full name.
Thank you guys, I’m glad you agree that [name_m]Jack[/name_m] is a classic!
[name_m]Jackson[/name_m]'s currently the most popular name in the US (when you add up the spellings) and has been rising fast in most other English speaking countries since the 1980s/1990s while [name_m]Jack[/name_m] has always been rather popular and continues to be so, therefore I’d deem [name_m]Jack[/name_m] the classic name and [name_m]Jackson[/name_m] the trendy one.