How did Hiram Ulysses Grant get changed to Ulysses S Grant?

Answer:
There was a mishap in college registrations. The clerk recorded him as Ulysses Simpson GRant. If he wanted his name changed he would have to re-enroll next year, so he kept it.
First answer by Oneillba. Last edit by Oneillba. Contributor trust: 2 [recommend contributor recommended]. Question popularity: 2 [recommend question].