Can [name_m]Jack[/name_m] be used as a nickname of [name_m]John[/name_m]? I know that [name_m]Jack[/name_m] is a diminutive of it but I wasn’t sure if it really worked. Thanks!
Yes, [name_m]Jack[/name_m] can be a nickname for [name_m]John[/name_m]. A lot of people used it as a nickname, even JFK was nicknamed [name_m]Jack[/name_m].
Of course it can.
I know someone who is a [name_m]John[/name_m] but called [name_m]Jack[/name_m] and someone else who is called [name_m]Jock[/name_m]
My husband is [name_m]John[/name_m] but has always gone by [name_m]Jack[/name_m].
Yes, [name_m]Jack[/name_m] is often used as a nn for [name_m]John[/name_m].
Yes! [name_m]Jack[/name_m] is a traditional nn for [name_m]John[/name_m] so I would say definitely 
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Yes, but I personally think it’s silly to name a baby [name_m]John[/name_m] and call him [name_m]Jack[/name_m]. I would just name him [name_m]Jack[/name_m], they are both 1 syllable.
To this date I’ve probably met over two dozen Johns that go bye [name_m]Jack[/name_m]. It’s a very popular nickname. I think it orginated from the Irish
I know a ton of [name_m]John[/name_m]'s who go buy [name_m]Jack[/name_m] as their preferred name.
Yes! Definitely! [name_m]John[/name_m] F. [name_u]Kennedy[/name_u] used the nn [name_m]Jack[/name_m]
[name_m]Jack[/name_m] actually is derived from [name_m]John[/name_m], so sure.
Yes [name_m]Jack[/name_m] has long been used as a nickname for [name_m]John[/name_m].
[name_m]Jack[/name_m] is one of those nicknames that originated from a need to differentiate between the 87 Johns in every town before last names were commonly used. That’s also how [name_m]Henry[/name_m] became [name_m]Hank[/name_m], [name_m]Harry[/name_m], and [name_m]Hal[/name_m], [name_m]Robert[/name_m] became [name_m]Rob[/name_m], [name_m]Bob[/name_m], [name_m]Hob[/name_m], and [name_u]Bert[/name_u], [name_f]Sarah[/name_f] became [name_f]Sally[/name_f] and [name_f]Sadie[/name_f], and [name_f]Elizabeth[/name_f] became [name_f]Eliza[/name_f], [name_f]Beth[/name_f], [name_f]Betty[/name_f], [name_f]Betsy[/name_f], [name_f]Ellie[/name_f], [name_f]Liz[/name_f], [name_f]Lizbet[/name_f], Liesbet, [name_u]Lisa[/name_u], and [name_f]Liza[/name_f].
Yes, [name_m]Jack[/name_m] can be used as a nickname for [name_m]John[/name_m].