Believe it or not, the term United Nations was actually coined by Franklin Roosevelt and Winston Churchill in a bathtub. Churchill was in Washington over the New Year's holiday 1941-42 and the two men were struggling with what to officially call their alliance. The term alliance was unacceptable in a formal document because, according to Churchill, it posed constitutional problems for Roosevelt——evidently a formal alliance would require Senate approval. Neither liked the alternative Associated Powers.
On the morning of 1 January 1942, Churchill, who was staying in the White House, was taking a bath when Roosevelt knocked on the door, was wheeled into the bathroom, and proposed the term United Nations. Churchill instantly liked the term, recalling some lines from Byron's Childe Harold：
"Here, where the sword United Nations drew,
Our countrymen were warring on that day！
And this is much——and all——which will not pass away."
Later that day Roosevelt and Churchill, along with representatives of the Soviet Union and China signed the United Nations Pact, pledging to fight Germany, Italy, and Japan to the last and to make no separate peace. Eventually twenty-two other nations signed the agreement and the name was taken later on for the post-war international organization.