According to Street Fighter V director Takayuki Nakayama, Ed's name was the result of a mix up from the development staff at the time.

"Oh and I just remembered, the origin of Ed's name," wrote Nakayama. "Our designer had him jotted down in his notes as 'The boy from the ED (ending)', and that got mistaken by someone who read the note as ED being his name. We started thinking 'Hey, that's kinda cool' and decided to use it as his name."

The ending in question is Balrog's ending in Street Fighter IV.
Contributed by ZpaceJ0ck0