Didymus is one of the Twelve.

Not as Didymus.. but he might have had two name, (St Peter was Simon Peter, and called Peter to distingish him for St Simon.) just as there were 2 James, (one being the lessor son of(????)senior moment-- of Zebedi?)

i can't name all twelve all the top of my head--I bet WOW could!-- but i'd recognize the names and didymus isn't one of them.