New Testament name, borne by one of Christ's twelve apostles, referred to as ‘Thomas, called Didymus’ (John 11:16; 20:24). Didymos is the Greek word for ‘twin’, and the name is the Greek form of an Aramaic byname meaning ‘twin’. The given name has always been popular throughout Christendom, in part because St Thomas's doubts have made him seem a very human character.
Irish: 1. shortened Anglicized form of Gaelic Ó hAinchín ‘descendant of Ainchín’, a personal name possibly related to the personal name Annach (see Hanna), unless it is a variant of ainghein ‘unborn’. 2. shortened Anglicized form of Gaelic Ó hAnnacháin (see Hanahan). 3. shortened Anglicized form of Gaelic Ó hAnnáin (see Hannan).