Hi Christopher. I too am researching Gucken/Guckin, etc. My GG Grandmother, Ellen (Ellena) Gucken, was born in Ireland approx 1840-1845, date is not determined. Many spelling variations on her children's bap certs, lastly Hackett!. Seems the names were sometimes used interchangeably. I have seen McGucken, McGuckin, M'Gucken, Guckeen, Guckian, and the list goes on! Frustrating to say the least. John is supposedly her father's name and one of her son's names. I work on her info for a while then I need to step away and work on someone else. I get too frustrated. Good luck to you.