User blog comment:WhitzellBlood/THE WILL OF D/@comment-69.243.149.190-20110708110045

I think it might be related to the Rio Poneglyph/Void Century. I think the Government was fighting another Government for control. Both might have had different views of how to govern people. Obviously the current Government that controls the world won but not everyone agreed with them and instead agreed with the "Will of the D(Government that lost)". So the ones that have the "D" in their names might be descendants of the extinct power that fought the Government or descendants of people who agreed with the "Will of the D. lol sounds kinda dumb but its the only thing i ever came up with.