God parents for your child yes or no ?

Malinda • I am 32 married we have 3 live and one miscarried. 11 yrd old girl 10 yr old boy and 4 yr old boy and we misscarried at 11 wk 2 days on oct 9 ,2014

What is a God parent for ? I have had so many people telling me they want to be God mom or God father but what's the meaning of it and do you have to have one for your child.