What is gods sister name?

Your Godparents (Godmother and Godfather) are family friends or relatives who your parents picked at your baptism to act as your Godparents. They are often required to be in good standing with your church before they can be appointed this role. Their role is generally understood as one where they ensure a child's religious upbringing is maintained in accordance with the their beliefs.

There is no historical use of the term "Godsister" as applied to the role of a "Godparent". Such usage is entirely subjective and its meaning is relative to the person using it.