Hi
Ryan ,
I'd say it's a variant of the English "
Jill " or "
Gillian ". You can check
Mike 's meaning for
Gillian by clicking on the blue-printed name.
Another site also says Jilly is English and a variant of
Gillian , but gives the meaning as "Jove's [
Roman god
Jupiter ] child".
"Jilly Coppercorn" is the principal character in several urban fantasy novels and stories by the Canadian writer
Charles De Lint.
Hope that helps.
- Da.