What was President Grant's first name given at birth?

One interesting and little-known fact is that he was actually born Hiram Ulysses Grant, and only became known as Ulysses S. Grant because of a clerical error. After being nominated to the United States Military Academy at West Point, his name was accidentally listed as Ulysses S. Grant.

Ulysses S. Grant (born Hiram Ulysses Grant; April 27, 1822 – July 23, 1885) was the 18th President of the United States (1869–77). Previously, as Commanding General of the United States Army (1864–69), Grant had worked closely with President Abraham Lincoln to lead the Union Army to victory over the Confederacy, in the American Civil War. As president, Grant implemented Congressional Reconstruction, often at odds with Lincoln's successor,Andrew Johnson. Twice elected president, Grant led the Republicans in their effort to remove the vestiges of Confederate nationalism and slavery, protect African-American citizenship, and supported industrial growth during the Gilded Age.