Another vote for Caspar :)
Caspar or Jasper. I agree with ash & namesy that Casper looks misspelled.
Most of these are interchangeable: Jasper Felix, Jasper Flynn, Jasper Amias, Jasper James, Jasper Henry, Caspar Hugo, Caspar Nathaniel, Caspar Elliot, Caspar Elias, Caspar John.
I definitely prefer Jasper! The only problem for me is that I always hear it spoken in Cruella DeVil's wicked voice. (Jasper was one of the two villians in 101 Dalmatians.)