Space Shuttle is the term for the combination of the orbiter, the external tank, and the two solid rocket boosters.
At times, the orbiter itself was referred to as the Space Shuttle. This was not technically correct as the Space Shuttle was the combination of the orbiter, the external tank, and the two solid rocket boosters. These components, once assembled in the Vehicle Assembly Building originally built to assemble the Apollo Saturn V rocket, were commonly referred to as the "stack".
but the name of the first orbiter to go was Columbia however as you can see here they call it a Space Shuttle Columbia. see
there were other spacecraft that orbited before.