What was Ulysses S. Grant's original first name?

Which president was nicknamed "Dubya"? Which president is called the "Father of His Country"? Which president was known as "The Great Emancipator"? Which president's middle initial "S" famously stood for nothing? What was Bill Clinton's birth name? What was Gerald Ford's birth name? Which president was a famous Rhodes Scholar at Oxford? Which president was a nuclear engineer officer in the U.S. Navy?