AnnieandHallie's mom - Are you from Canada? The only person I've heard call it a Davenport are my Canadian relatives, who coincidentally have a daughter named Hailey. When they told me to sit on the Davenport I didn't know what to do.
When I grew up it was a couch, now I use both interchangeably. Also, it used to be a cellar as a Philly kid, now it's more often basement. Even when I grew up if you refinished it, it became a basement. Cellars are creepy and have mice. Oh, and we drink soda.