Of uncertain origin — possibly from Jug, a 16th-century pet name for Joan or Judith.
A large container with a narrow mouth and handle, used for holding and pouring liquids.
Of uncertain origin. Possibly a pet form of the name Joan, Joanna, or Judith — jugs were sometimes personified with women's names in the 16th century (compare 'jack' for various containers). Alternatively related to Scottish joug 'pillar.' The slang 'jug' meaning 'prison' appeared around 1815. Key roots: Jug (English pet name: "nickname for Joan/Judith (speculative)").
Several English containers are named after people: jug (possibly from Joan), jack (a leather drinking vessel), jeroboam (a large wine bottle named after a biblical king), and demijohn (from French dame-jeanne 'Lady Jane').