If I remember the story correctly, Joe Simcox was visiting Edgar Valdivia one day and while sampling dragon fruit thought that this particular seedling was the best of those that he tried. Edgar generously gave him a cutting to propagate, and when asked about the name said "call it what ever you want." So Joe took it back to Baker Creek for propagation and named it Edgar's Baby.
I have been growing one out for two years now, and hopefully I will get fruit this season.
Cheers,
Richard