Derivative of Jane, with the addition of the suffix -ice, abstracted from girls' names such as Candice and Bernice. It seems to have been first used as the name of the heroine of the novel Janice Meredith by Paul Leicester Ford, published in 1899.
English and Welsh: patronymic from the Middle English personal name Jon(e) (see John). The surname is especially common in Wales and southern central England. In North America this name has absorbed various cognate and like-sounding surnames from other languages. (For forms, see Hanks and Hodges 1988).