How many young Jacks do you know?

[MurrayMoo]

Just that really. I know it's popular but don't know any little Jacks personally and only know one grown up Jack. Is it super popular? Any mum's with school kids give an idea as to how many in a class. Is Zack as nice..? (Would have to be Zachary)

One man in his twenties, one teenager and one older child. No babies or toddlers.

I actually don't know any. I used to teach secondary and knew a few then (a couple of years ago) but no little ones. I know 2 Zacharys under 2.