Common names: Mugwort, Moxa, Traveler?s Herb, Artemis Herb, Felon Herb, Muggons, Old Man, Sailor?s Tobacco. Cingulum Sancti Johannis aka St. John?s plant (NOT St. Johnswort).
Check nature sites like this to find common names of plants, also search the plant pretty thoroughly before considering to use it. I would also recommend learning the spelling of the plant as well. It's Mugwort with an O not an A