In the phrases, "For the love of Mike" and "For Pete's sake"who is/was Mike and Pete?

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For the love of Mike - (euphemistic) for the love of God

https://en.wiktionary.org/wiki/for_the_love_of_Mike

For the love of Mike. This is a "minced oath" (a substitute for "for the love of God")that refers to "Mike," meaning an Irishman, aka Mick. Variations: "Holy Mike" and "mother of Mike." "Random House Historical Dictionary of American Slang, Volume 1, H-O" by J.E. Lighter, Random House, New York, 1994.

http://www.phrases.org.uk/bulletin_board/5/messages/677.html...Show more

"Mike" is pre marital" when he can do no wrong, "Pete" is the same guy post marital when he does nothing right. Then after ten years we gain a religious notoriety....Show more

They are euphemisms for "God" or "Jesus" or "Christ." They might refer to the archangel Michael and to St. Peter, or they may just be random names....Show more

A euphemistic variant of for Christ's sake, for God's sake; "Pete" perhaps invoking Saint Peter and Mike, St Michael or perhaps influenced by for pity's sake. Used instead of from Christ's sake as this was seen as blasphemous by early Christians. Also Good grief and similar....Show more

Mike = Saint Michael.
Pete = Saint Peter....Show more