From northern Middle High German becker, from Old High German beckeri. Synchronically from backen + -er. Upper German originally used the words Beck and Pfister instead. The Central German form was reinforced by Middle Low German becker, from Old Saxon backeri. Both possibly from Proto-Germanic *bakārijaz (compare also Dutch bakker). English baker is closely related but derived from a different verb stem.
- Bäcker in Duden online