Sup, iam Ruth Crabtree, Don’t overdo it!

How Did John Become Jack? [Solved]

It dates back to the 13th century. In medieval English, diminutives would form on some names by adding -kin to the end, a formation borrowed from Dutch. The medieval equivalent of ‘John’ was ‘Jan’, which became ‘Jankin’, then ‘Jackin’, and finally ‘Jack’.

Becoming Captain Jack- Pirates of the Caribbean 1 special features

Johnny Depp as Captain

John Makes Little Jack Cry - Red Dead Redemption 2

https://store.playstation.com/#!/tid=CUSA03041_00.

Jack Black Performs His Legendary Sax-A-Boom with The Roots

Jack