Definition of "Jan"

"Yes, Mommy," answered Janice. Then she turned to her friend and asked, "Shall I wear my light chintz and kenton kerchief, or my purple and white striped Persian?" "Sufficiently smart for a country lass, Jan," cried her friend.

1899, Paul Leicester Ford, chapter 1, in Janice Meredith

She's startled. How long has it been since he called her Jax instead of Janet or Jan? The last is a nickname she secretly hates. It makes her think of that syrupy-sweet actress on Lassie when she was a kid, the little boy (Timmy, his name was Timmy) always fell down a well or got bitten by a snake or trapped under a rock, and what kind of parents put a kid's life in the hands of a fucking collie?

2008, Stephen King, Just after Sunset, Simon and Schuster, published 2009, page 129