δίδυμος, διδυμη, διδυμον and Δίδυμος, Διδυμον, twofold, twain, (double, Homer, Odyssey 19, 227; as τριδυμος, triple; τετραδυμος, quadruple, ἑπταδυμος); hence, twin (namely, παῖς, as τριδυμοιπαῖδες, υἱοί, German Drillinge, three born at a birth), Hebrew תְּאֹם, a surname of the apostle Thomas (cf. Luthardt on the first of the following passages; B. D. under the word, Thomas): John 11:16; John 20:24; John 21:2. (Homer Iliad 23, 641.)
John 11:16 - N-NMS GRK:ὁ λεγόμενος Δίδυμος τοῖς συμμαθηταῖς NAS: who is called Didymus, said KJV: is called Didymus, unto his fellowdisciples, INT: called Didymus to the fellow disciples
John 20:24 - N-NMS GRK:ὁ λεγόμενος Δίδυμος οὐκ ἦν NAS: called Didymus, was not with them when KJV: the twelve, called Didymus, was not INT: the [one] called Didymus not was
John 21:2 - N-NMS GRK:ὁ λεγόμενος Δίδυμος καὶ Ναθαναὴλ NAS: called Didymus, and Nathanael KJV: Thomas called Didymus, and Nathanael INT: called Didymus and Nathanael