From The Collaborative International Dictionary of English v.0.48 [gcide]:
Jane \Jane\ (j[=a]n), n. [LL. Janua Genoa; L. Genua, also OE.
Jean.]
1. A coin of Genoa; any small coin. --Chaucer.
[1913 Webster]
2. A kind of twilled cotton cloth. See Jean.
[1913 Webster]