Mac Seagháin
Mac SEAGHÁIN, Mac SEÁIN—V—M'Sheain, M'Sheane, M'Shaine, M'Shaen, MacShane, MacShan, MacCheyne, Shane, Cheyne, Johnson, (Johnston, Johnstone); 'son of Jean,' the Norman-French form of John. The MacShanes of Tyrone are a branch of the O'Neills.
Alphabetical Index to Irish Surnames