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I would not go with matching names. I find that when parents match twins/triplets/quadruplets names, the quality of the other name(s) is being sacrificed to enhance the quality of the favorite name (in your case, Robyn). If I were you, I'd keep Robyn and Emma, and then think of a third name that doesn't begin with a R or an E. I'd also try to find a name that ends in an "ie" sound (or basically any other sound than "en" or "a") in order to vary the endings. Also, I think Roberta will forever be linked with the name Robert, and it also just doesn't have a nice sound to it.
Here are some suggestions that would go with Robyn and Emma:
Lizbeth
Violet
Willow
Shiloh
Lilith (nickname Lily)
Jamie
Lacey
Cyan
Mary-Kate
Lee
Chrisanne
But if you're set on the triple R's, I'd go with Robyn, Rose(mary), and Rowanne. I really don't think I'd like to have a matching name though if I were a triplet. I'd feel a bit cheated if I knew the quality of my name was sacrificied only to go with one of my triplet's names. Matching could be cute for twins, but for triplets, it just seems a bit annoying. Best of luck with your choices! :)