As you may know the terms "God" and "Jesus" are considered offensive when used in certain situations. This led to replacements or bastardizations of these words: Geez/jeez = Jesus Gosh = God Similiarly the expressions "for God's sake" was replaced with "for Pete's sake" in order to lose the offensive term in the sentence. The same thing happens in Dutch: Sjezus = Jezus (Jesus in English) Goh = God (spelled exactly like the English word for God, but pronounced differently) Gossie = God And in offensive phrases: Getverdemme/Gadverdamme/Goftedomme = Godverdomme (literally: God damn me!) Hope this helps. :)

for God's sake, for heaven's sake are more common expressions. And Pete is a boy and maybe if you have son called Pete you can say for Pete's sake.