Впервые о том, что второе имя президента Трумэна - Сергей, я услышала несколько лет назад. В фильме 18 Again! Но недавно решила проверить, а правда ли? И вот, что накопала:

Although most "officialized" biographies will agree that his middle name was just the letter "S," that is a historical fabrication, covering up for the fact that he had a soviet sounding name. Harry Truman started this fallacy himself, when he was asked in a newspaper interview in 1932. He stated that the letter S had been picked as a compromise between the names of his two grandparents, Solomon and Shipp. For the truth of the matter, you have to either look at the birth records for Lamar Missouri (there is only one Truman born there on May 8 1884 - "Harry Sergei Truman." Read the autobiography of Allen W. Barkley (Truman's VP) or read the superlative "an Underground Education" by Richard Zacks. It is for this reason alone that Harry Truman's birth certificates are not on display at his presidential museum. My answer of "The incorrect answer that you are looking for is "S" Harry Truman started the rumor that his parents hadn't been able to settle on a name and had simply called him Harry "S" Truman. You see Harry was embarrassed that his middle name was in fact "Sergei"-- a name which at the time sounded too Soviet for a president of the USA. "He was actually named after his Mexican uncle" was in fact the only correct answer.