I grew up in the Delaware/Maryland area, and the Delmarva Peninsula was named by combining the names of all 3 states (Delaware, Maryland, and Virginia) located there. The Delaware-Maryland border also has a bunch of towns that combine the names of the states, like Delmar, Mardela, and Marydel.
Is this combo name situation unique to that area because the state names fit together so well, or do other places do it too?