Scottish, from the port town at the mouth of the River Leith,Â near Edinburgh. Â The name of the river is from Gaelic meaning "wet". Â There is a similar word in Welsh, usually translated as "moist, damp".
Our correspondent [LD2] notes that the name occurs in Australia as both male and female names. Â The name occurs a few times in the 1841 Census of Aberdeenshire but only as a male name.