Who was the first person to discover wormholes?

as stated in the other ans, wormhole or its scientific name, Einstein-Rosen bridge, was discovered by Ludwig Flamm in 1916. But note that Flamm's discovery was through a general relativity solution on black hole dimension by Schwarzschild. Both Schwarzschild's solution and Flamm's discovery are purely mathematical - no wormhole in reality has been found so far.

The first who discovered The Einstein Roses bridge it was discovered by Ludwig flamm in 1916 a few months after Schwarzschild published his solution and was rediscovered by Albert Einstein and his colleague Nathan Rosen which was published then in 1935