Jack

Meaning

In the excerpts, Jack is treated as an English diminutive and nickname form tied to John/Jan, and also linked to the older name Jacob in related traditions. The biblical root behind these names is often given as ‘supplanter’ for Jacob, while the John connection is the more common modern explanation for Jack as a given name. The 1884 source also notes an older folk association with ‘grace of God,’ but this looks like a historical naming gloss rather than the standard etymology.

Origin

Fun fact

One excerpt says Jack became mixed up with Jock in the camps of the Black Prince and Henry V., showing how nicknames could blur across English and French in medieval life.