Definition of "Jean"

There's not a bonnie flower that springsBy fountain, shaw, or green,There's not a bonnie bird that singsBut minds me o' my Jean.

1788, Robert Burns, Of A' the Airts the Wind Can Blaw

Isn't Jean a pretty name?""Not bad; but why don't you call her Miss Muir?""She begged me not. She hates it, and loves to be called Jean, alone."

1866, Louisa May Alcott, chapter II, in Behind a Mask, or a Woman's Power

He was trying to think of her name; she had come to cook him dinner twice last spring. Jean, maybe. Or Betty. One of these plain names.

1972, Anne Tyler, The Clock Winder, Knopf, page 67