Here are the names of the dolls according to the back of the Peggy box.
Front row, from left to right: No name, Melon, Kelly
Back row, from left to right: Peggy, no name, Shelly
I think the ones with no names are dolls that Mattel did not sell nor plans to sell in Japan.
I think the one on the top of the back row is Jenny and a Japanese collector told me that Mattel couldn't use that name here because of conflicts with Takara's Jenny doll.
The one in the middle of the front row is an AA I think and we usually don't get the AA versions of dolls here in Japan.