This is an excerpt from a Chicago Tribune article:

In 1850, the Germans who settled in the Wilmette area named their township New Trier after the German city of Trier. That city was settled by a Gaulish people called the Treveri and was also known as Treves — which is why New Trier High School athletes are called Trevians. Little did the Illinois settlers know that Trier would soon be known as the birthplace of communist icon Karl Marx.