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O'Hagan Name Meaning
Irish: Anglicized form of Gaelic Ó hÁgáin ‘descendant of Ágán’
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From O'Hagan Family Pedigree: retrieved from: http://www.libraryireland.com/Pedigrees1/o-hagan-heremon.php
1601: The O'Hagans, whose principal seat was at Tullaghoge, were the Law-givers to the O'Neills, Princes of Tyrone. In the year 1602, the lord-deputy Mountjoy remained at Tullaghoge, for five days, and "broke down the chair whereon the O'Neills were wont to be created; it being of stone planted in the open field."—See Fyne's Moryson's Rebellion of Hugh (O'Neill), Earl of Tyrone, Book iii., c. i.
Sir Nicholas Malby in a report on the state of Ireland, which he made to Queen Elizabeth, in 1579, describes the O'Hagan of Tullaghoge, barony of Dungannon, and county of Tyrone, as one of the principal men of note in that part of the country.
[3] Shane: In "King James's Army List (1689)," preserved in the MS. Vol. F. 1. 14, in the Lib. of Trin. Coll., Dublin, and published by Dalton in 1855, are the names of "Art O'Hegan," and "John O'Hegan;" and of "Art O'Hagan, Cormuck O'Hagan, and Daniel O'Hagan." The John there mentioned could have been a son of the Shane (or John) who is No. 123 on this pedigree, and who fought against the Cromwellian Army, at the Battle of Ticroghan, in June, 1650.