How did Irish Run in Pennsylvania get its name? This page provides a brief history about Irish Run in Pennsylvania.
Small stream in Plumstead Township, rising near Hinkletown. After flowing eastwardly southeast of Wismer, it makes a sharp turn towards the northwest and empties into Tohickon Creek between the mouth of Cabin Run and Stovers Park. The stream does not appear on the county maps. Though charted on the maps of the Geological Survey, it is not named there. How it received the name of Irish Run is not clear, and probably not many residents of the township today would know the stream by that name. The pioneer settlers along the stream preceding the Germans were Irish, which may account for the name.