What Sam Fool Thing Have You Done, For Pete's Sake?

The other day I got to thinking: Where did I get all these "Pete-related" sayings?

"For the love of Pete." 

"For Pete's sake.

"Heavens to Pete."

I've never even known a person named Pete. 

I wonder where these sayings originated?

I had a friend once who told me that when she was a child, she would play with her cousin at her aunt's house. And every time she turned around, her aunt was scolding her cousin for something or other.

"Damn it to hell, Bob!" she said her aunt would yell.

So my friend, as a child, thought that this was his name. "Damn it to hell, Bob!"
 
Isn't that funny? Poor Bob.

And then there's Sam. Don't think I've ever personally known a "Sam" either.

But I find myself saying: "What Sam fool thing have you done now?"

Who's Sam? Did he get in trouble a lot, like Bob? 

I think back, and I can't recall when I started using these phrases. Heard them from my childhood, more than likely.

Do you have figures of speech that involve people's names?