Didymus

In Bible versions:

Didymus: NET AVS NIV NRSV NASB TEV
Twin: AVS NRSV TEV

a twin; double

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a man who was one of Christ's disciples and was also called Thomas
the man who was one of the twelve disciples and became Thomas the apostle

Greek

Strongs #1324: didumov Didumos

Didymus = "two fold or twain"

1) a surname for the apostle Thomas

1324 Didumos did'-oo-mos

prolongation from 1364; double, i.e. twin; Didymus, a Christian: KJV -- Didymus.
see GREEK for 1364

Didymus [ebd]

(Gr. twin = Heb. Thomas, q.v.), John 11:16; 20:24; 21:2.

DIDYMUS [smith]

(the twin), a surname of the apostle Thomas. (John 11:16; 20:24; 21:2) [THOMAS]

DIDYMUS [isbe]

DIDYMUS - did'-i-mus (Didumos, i.e. "twin"): The surname of THOMAS (which see).