出典:Wiktionary
Usually a clipped or hypocoristic form of Jennifer, although also used for Jean, Jeanette, Jeannette, etc.
Doublet of Ivanka, Jan, Janelle, Janet, Janey, Janine, Jeanette, Jeanie, Jeannette, Jeannine, Jenna, Jenny, Jessie, Jo, Jody, Juanita, Shanae, Sinead, and Vanna in these secondary derivations.