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Surnames of Ireland by Dr. Edward Maclysaght gives the following explanation for MacGuckian - Guckian and Hackett
Guckian is found in County Leitrim - Page 139;
Hackett: Haiceid in Gaelic. Families of this name have been in Ireland since the Anglo-Norman invasion, mainly in Counties Kilkenny and Kildare. A Branch in Connacht became completely hibernicized and was known as MacHackett and also as Guckian. In Counties Armagh and Tyrone Hackett has been used as a synonym of MacCahey - 141 Page.
My G granfather was Hackett from the townland of Keelagh in the the parish of Bornacoola - near Mohill Co Leitrim. Whilst researching a Hackett lady told my sister that when the hackett's went to America they changed to Guckian. I have several trees on ancestry one of them has a lot of my Hackett family on it. Definately do DNA and we might find each other.