Other forms: transalpines
Use the adjective transalpine to describe people who live just north of the Alps, like your friend who lives in southern Germany.
You're most likely to hear the word transalpine in a geography or earth science class. It assumes that you are looking north from Italy, toward the mountain range known as the Alps, and that you're talking about something on the far side of them. The prefix trans, "across" in Latin, along with alpine, which means "of the Alps," gives us the meaning "across the Alps."