Ballymount is in Clondalkin parish. I looked at the Tithe and the Griffiths for that parish and did not see a Bard/Beard record. I also looked at the 1901 census and there is a very large house in Ballymount Little that had 17 rooms. Not sure if that might be the estate. http://www.census.nationalarchives.ie/reels/nai003692939/
Sorry I could not be more helpful.