"Helrode" is the original name of a village belonging to the town Eschweiler in Germany/Rheinland. The village today is "Hehlrath" (Look at wikipedia!). It was founded by Gerardus de Helrode, a "Ritter" and "Schöffe" in Aachen, who lives at his Castle in Helrode, which perhaps was the Haus Cambach, today the Bauernhof Kugel at the Oberstraße or the Bauernhof Schleip near by the church.
The name of Hehlrath in the dialecttoday is a shortform of Helrode: Hähle.
A hardo is a person who tries extremely hard at everything. Most times a hardo will try very hard at things that do not require excessive effort. For example, sports practices, gym class, etc.
Wow did you see Jack at practice today? What a hardo!