Hi,
If the the 3rd name is not the vicar/pastor, then possibly the people of the area are following the same custom that I've been brought up with in England.
A baby girl has two godmothers and a godfather. A baby boy has two godfathers and one godmother. The godparents duty is to guide the child through its life to become a good citizen and church-goer. I would only be guessing why there are 3 godparents, men had more legal rights so presumably that's why the female had a male godparent, also death came early sometimes hence the third godparent.
Rena in England