I just relies in Justice League Unlimited the Flash name was Wally West, so why is his name Barry Allen now and Kid Flash is Wally?

In the comic Книги Flash (Barry Allen) dies and Wally takes over. In YJ, Flash is still alive, so wally hasn't taken over. Also, in Justice League Unlimited they're probably going by the comic books, YJ doesn't go by the comic books.

Young Justice is completely different from the comics and JLU. (JLU Is better in my opinion, because it is almost exactly like the comics, with a tad bit of Анимация flair and director imagination)