Probably from jack, a male servant of any rank, later associated with a boy servant or any boy, and later still associated with knave (a rogue, thief, or deceitful man).
Jack may also be related to the Spanish use of jaque which noun literally means check or checkmate in chess but which can also be used as a synonym for bully.
"jacker." YourDictionary, n.d. Web. 14 January 2019. <https://www.yourdictionary.com/jacker>.
jacker. (n.d.). Retrieved January 14th, 2019, from https://www.yourdictionary.com/jacker
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