jane

A female given name from French, the standard feminine form of John since the 17th century.

In latter years some of the better and nicer sort, misliking Joan, have mollified the name of Joan into Jane, as it may seem, for that Jane is never found in old Records; and as some will, never before the time of King Henry the eight.

People will please their fancies, and every lady has favourite names. I myself have several, and they are mostly short and simple. Jane, that queenly name! Jane Seymour, Jane Grey, 'the noble Jane de Montford;' - - -

A surname originating as a patronymic derived from a Middle English variant of John.

used as a placeholder name for any woman, especially a young working-class woman

A girlfriend.

What happened to your regular Jane?

Alternative letter-case form of jane (“female client of a prostitute”).

A silver Genovese coin, first used in England in the 14th century.

14th c, Geoffrey Chaucer, The Rime of Sire Thopas, The Canterbury Tales, 1793, A Complete Edition of the Poets of Great Britain, Volume 1, page 124, His robe was of chekelatoun, / That coste many a jane.

Certes was but a common Courtisane, / Yet flat refusd to haue a do with mee, / Because I could not giue her many a Iane.