I've got some good friends near Drogheda and have visited the place, but I wanted to double-check that the way I pronounced it was actually valid: http://forvo.com/word/drogheda/#en It makes a lot more sense if you look at the original Gaelic name for the town: "Droichead Átha". "Droichead" is a bridge, and "áth" is a ford ("átha" means of the ford). The pronunciation is the same as what you hear on Forvo. "Drogheda" is just the anglicised name, and like many anglicisms of Irish place names, it's pretty poor.