What gives a double reed instrument its name?

Answer 1

The reed is the wooden piece that's used to create a sound on a woodwind instrument. Normally, only one reed is used, and it is held against a plastic piece at the top of the instrument. However, in double reed instruments, there are two reeds that are tied together. When you blow air between these reeds, they both vibrate, producing a timbre distinct to double reed instruments.

Answer 2

They use two single reeds wired together. That's what the player blows through to produce sound.