Hi,
My mistake, you wrote about the place "the Topp" and not the family Topp. I can trace my paternal Reid family in Scotland back to the beginning of the 18th century. My maternal McGuire family came over from Ireland somewhere around the beginning of the 20th century from Fermanagh/Tyrone and are very difficult to trace in Ireland. Perhaps you could clear up one thing, One branch of the family stated they were married in Castlegarig (at least that was written on the transcription). I cannot work out where that is. Maybe Gaelic pronunciation but written phonetically?
Allan