Decies is pronounced DEES-eez.
I'm quietly fond of the name Hackballscross, Co Louth, and also Coolfancy, Co Wexford. Then there are complicated ones like Muirhevanmore, Co Louth, which I think means the grave of the great woman, and Muiceanach Idir Dhá Sháile, which means the place of boars between two saltwater inlets.
Dublin has nice names - Mullinahack around where Oliver Bond flats are now, and meaning the Mill of the Shit; there's an image to conjure with. And there's the conjunction of streets built by Henry Moore, Earl of Drogheda, which include Henry Street, Moore Street, Earl Street, Of Alley (now Henry Place), and Drogheda Street (now the northern part of O'Connell Street).