Ok, so we have the two canon and also two best Pie sisters:

Pinkie Pie > Pinkamena Diane Pie
Maud Pie > Maudileena Daisy Pie

But we need two more! So here they are:

Marble Pie > Marbaleena Delizabeth Pie
Limestone Pie > Limestonamith Delilah Pie

Posting mostly so I don't forget this later.