The Guinness brewery in Dublin is one of the most famous tourist attractions in Ireland. On their website they have a section of interest to genealogists, employment records.
A search of the indexes shows that at least two Buggy’s worked there. [1]
Patrick Buggy: Born 14 October 1878/ Died Unknown/ Date Commenced Employment 3 December 1892/ Occupation Labourer
Julia M. Buggy: Born 4 August 1915/ Died 25 January 1988/ Date Commenced Employment 15 January 1943/ Occupation Dishwasher
More information, including employee numbers, can be found in the indexes.
[1] Guinness-storehouse.com, Trace You Guinness Roots. http://www.guinness-storehouse.com : Accessed 15 February 2011
Buggy Name History 
Hello. My father worked at the Guinness brewery in the 1960s, he passed away in 1997. We are trying to write a book about his life and would be very grateful if you could provide us with some information about his time there. Many thanks.
Would u b able to tell me who was the oldest man to b given a job at Guiness Brewery my father worked there in the 1960 s thank you