Didymus

Concise Bible Dictionary:

See THOMAS.

Strong’s Dictionary of Greek Words:

Greek:
Δίδυμος
Transliteration:
Didumos
Phonic:
did’-oo-mos
Meaning:
prolongation from 1364; double, i.e. twin; Didymus, a Christian
KJV Usage:
Didymus

Jackson’s Dictionary of Scripture Proper Names:

double, i.e., a twin

Potts’ Bible Proper Names:

A twin; double:―a surname of the apostle Thomas, John 20:24. {Geminus}