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.
English, German, Danish, and Swedish: nickname or byname for someone of a frosty or gloomy temperament, from Middle English, Middle High German, Danish, Swedish winter (Old English winter, Old High German wintar, Old Norse vetr). The Swedish name can be ornamental.