Title^
[name_u]Jack[/name_u] is kind of stretchy, but if it works as a nn for [name_u]James[/name_u] and [name_u]John[/name_u], I don’t see why it can’t work as a nn for [name_u]Jupiter[/name_u]! [name_f]My[/name_f] initial thoughts would be [name_m]Peter[/name_m] or [name_u]Terry[/name_u], but I think [name_u]Jack[/name_u] could work just fine and it’s super cute!
2 Likes
I think it can work but I wonder if [name_u]Jack[/name_u] might eventually completely take over the name…
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I’m not a huge fan of unintuitive nicknames, so I’m going to say probably not.
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It’s too much for me but I would go straight to the nickname rather than naming him something then using a stretchy nickname. [name_u]Jack[/name_u] is much more common than [name_u]Jupiter[/name_u] so most people would assume that to be his given name.
Where it’s such a stretch I honestly don’t see it having real staying power irl. I would honestly pick either or…. Not try to make one lead to the other
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I think it’s such a different name, style and sound wise that I don’t think it really works as a nn.
I guess it could, but I don’t really get it - a super distinctive and sparky name with a super popular nickname 
But I guess that might be a positive, if he doesn’t like [name_u]Jupiter[/name_u]
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I find it to be way too much of a stretch but im also definitely biased because I do not understand why someone would name their son something as awesome and distinctive as [name_u]Jupiter[/name_u] and then dilute it by calling him such a popular and (imo) overused nickname
I agree with a lot of the opinions here saying it’s a stretch, but maybe [name_u]Jay[/name_u] could work?
[name_u]Jupiter[/name_u] > first letter J > pronounced [name_u]Jay[/name_u] 
Hard to imagine this in real life. But [name_u]Jupiter[/name_u] isn’t really a name that feels right to me anyway.
It makes no more sense than [name_u]Jack[/name_u] as a nickname for [name_u]Joseph[/name_u] or [name_u]Jayden[/name_u] or [name_u]Julian[/name_u].
Yes