The name Plummer is a boy's name of English origin. Plummer and is often added to lists like Occupational Baby Names and discussed in our forums with posts like "Medium CAF (with different naming systems)".
From the experts:
Plummer might be an occupational name for someone who works with pipes -- yes, like a plumber -- or with feathers, from the Olde English (from the French) plume. Or it could indicate someone who lived near a plum tree.
The plum association is delicious; the plumber association, not so much. If you like occupational names, better go with Gardener or Sawyer.