An Etymological Dictionary of the German Language/Annotated/Beck
Beck, masculine, ‘baker,’ only dialectic (Alemannian, Suabian, Bavarian), from Middle High German bęcke, Old High German bęccho, akin to backen; the Gothic form may have been *baqja; Modern High German Becker is a recent form with the termination -er denoting the agent (Anglo-Saxon bœcere, English baker). In Modern High German Beck, Boeckh, as well as Bäcker, have been preserved as family names.