Anglicized form of Gaelic Domhnall. The final -d of the Anglicized form derives partly from misinterpretation by English speakers of the Gaelic pronunciation, and partly from association with Germanic-origin names such as Ronald. This name is strongly associated with clan Macdonald, the clan of the medieval Lords of the Isles, but is now also widely used by families with no Scottish connections.
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.