French: from the Latin name Claudius. It was borne by various early saints, but its popularity in France is largely due to the fame of the 7th-century St Claude of Besançon. This form is widely used in the English-speaking world and has superseded Claud as the preferred spelling in Britain and the United States.
English: habitational name from any of various places so called, for example in Lancashire (near Blackpool) and in North Yorkshire. The former was named in Old English as ‘settlement by the watercourse’, from Old English lād ‘watercourse’ + tūn ‘enclosure’, ‘settlement’; the latter as ‘leek enclosure’ or ‘herb garden’, from lēac ‘leek’ + tūn. Compare Leighton.