Able Spudmore was one of the founders and owners of Ellerby and Spudmore, makers of racing brooms in the mid-twentieth century. Able’s son Randolph Spudmore was the designer of the famous Firebolt racing broom (c. 1993) (Pm).
Designing and producing racing brooms.
Able is either a variant of Abel - from the Hebrew name הֶבֶל (Hevel), meaning "breath" (Behind the Name) - or from the English word able, "having the power, skill, means, or opportunity to do something", ultimately from Latin habere "to hold" (Behind the Name user).
A spud is English slang for a potato.
Lexicon list of Broom Manufacturers
From the Web
Writing by J.K. Rowling on Pottermore: Firebolt
Pottermore feature: Broomsticks
Harry Potter Wiki: Brooms