More info about the name "Jagusia"
Jagusia is a diminutive of Agnieszka, itsef a Polish variant of Agnes. Agnes originates in Greek language and means "sacred, chaste". Probably encouraged by Saint Agnes of Rome, a famous Christian saint, the name has been one of the most popular feminine given names for centuries, with occasional changes in spelling. Saint Agnes is the patron saint of chastity, engaged couples and virgins.