Bishop's goutweed: It was imported into multiple regions as an ornamental plant, but it then became an invasive weed. It was often called bishop's goutweed because it was typically found near the ruins of the old church. Goutweed is derived from its specific epithet, podagragria which holds the meaning of gout of the foot.
Ground elder: The name, ground elder comes from the superficial similarity of its leaves and flowers to those of elder (Sambucus), which is unrelated. It is the type of species of the genus Aegopodium.