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.
North German: topographic or occupational name for someone working or living by a clay pit, from Middle Low German lēm ‘clay’ + kule ‘pit’, habitational name from any of several places named with this term, for example Lehmkuhlen near Kiel. Compare South German Leimkuehler.