The EBCU manifesto says: "Consumers have the right to know who brewed the beer and where it was brewed." That's all I really want to know. Whether they call themselves Irish or a brewery doesn't matter to me: just put on the label where that beer was made and by which company.
Irish labelling law at the moment just says that the label must have an address on it, but that can be any holding company, distributor or importer, and not even every Irish beer maker even complies with that (*cough*Brown Paper Bag*cough*). It [i:36ra9lr2]is[/i:36ra9lr2] illegal to mislead people on the origin of a product, but I suspect "Brewed in the EU" provides a nearly universal get-out clause there.