It doesn't - if they did, the Dept of Environment, Community and Local Goverment would be named the Dept of Housing, Local Government, Water, Planning, Environment, Community, Local Government Auditing, Voting, Building Standards, Fire services, Emergency Management, Waste, Climate Change, Rural Development, Rural Recreation, Community Development and Weather.
Oh the wits are there all right, but operating under the radar. The Dept of Community, Rural And Gaeltacht Affairs was commonly known as Craggy Island in the last Govt. The Minister of Justice Equality and Defence is commonly known as JEDward.