Click on the red marker on the map below for a link to the full 1901 census entry.
fairly rare: Down etc. Ir. Mac Shuibhne (SI) i.e. equivalent of Mac Sweeney, but Black states that it is a Galloway form of Mac Kenzie, Scots Gael. Mac Coinnich. See also Mawhinney.
numerous: Ulster generally, especially Antrim-Down. Ir. Mac Shuibhne, from first name Suibhne (pleasant), so synonymous with Mac Sweeney. It seems to be a Scottish name from Galloway, where there is some confusion with Mac Kenzie. MIF & SS.