What would the origin of the saying "Third time's the charm" ? I've also heard it used as "third time lucky" ....Does anyone know if they are related ?
I think the origin of these phrases is from Shakespeare's The Merry Wives of Windsor, 1602:
Since these two variations can be traced back to the same time period and the same country, I think it's safe to say they are related and that they both echo Shakespeare.
Edit: Heck, why not throw a pretty Ngram in for good measure:
Gary Martin at The Phrase Finder has the British phrase third time lucky derived from the earlier "proverbial" luck of the third adventure, traced in print back to 1839. As to the reason for the luck, the theory of it referring to an English law freeing a condemned man after three failed attempts at hanging is debunked. He concludes:
And on its relatonship to the American version, third time's the charm:
A citation is given of this phrase from 1912.