In the past, anime dubbing was pretty complicated. They change names, songs, titles, and a lot more.
But today anime dubbing is pretty cool and wonderful. They don't change the names, songs, titles, and everything else any more.
Funimation is probably the top anime company in North America right now. It has dubbed Dragon Ball, and many other great classic series.
The anime industry can sometimes seem unstable. Some companie that were competely dependant on anime dubbing have gone out of buisness.
No matter what company dubs it though, they are all super cool and wonderful dubs.