This was formerly written Sleyney and when first used as a surname carried the prefix Mac: the Fiants of 1569 and 1583 mention two MacS1eyneys,both of Ballygeany, Co. Cork. It is not, however, a true Gaelic surname, as it was the Gaelic patronymic adopted by the Norman Fitzstephen family of Co. Cork. It has always been rare outside that county and the adjacent parts of Co. Waterford: in the latter it has sometimes been spelt Sleaney. Another form of the same name is Sleyne, which was borne by a notable bishop of the penal times, John Sleyne of Cork and Cloyne. I presume that Sline, well known in the Dublin commercial world, is the same: Cork and Ross wills of the eighteenth century include those of Slyne and Sline. The christian name to which the Mac was first prefixed must be obsolete-the suggestion that it was Stephen would imply that L was substituted for T, which is unlikely.

Mac Sléimhne This is a Gaelic patronymic assumed by the Norman family of FitzStephen of Co. Cork. Sliney and Slyne are modern Variants of it.

MIF 220; SIF 139

This was formerly written Sleyney and when first used as a surname carried the prefix Mac: the Fiants of 1569 and 1583 mention two MacS1eyneys,both of Ballygeany, Co. Cork. It is not, however, a true Gaelic surname, as it was the Gaelic patronymic adopted by the Norman Fitzstephen family of Co. Cork. It has always been rare outside that county and the adjacent parts of Co. Waterford: in the latter it has sometimes been spelt Sleaney. Another form of the same name is Sleyne, which was borne by a notable bishop of the penal times, John Sleyne of Cork and Cloyne. I presume that Sline, well known in the Dublin commercial world, is the same: Cork and Ross wills of the eighteenth century include those of Slyne and Sline. The christian name to which the Mac was first prefixed must be obsolete-the suggestion that it was Stephen would imply that L was substituted for T, which is unlikely.