The Collaborative International Dictionary of English v.0.48:

Waller \Wall"er\, n.
   One who builds walls.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Waller \Wall"er\, n. [G.] (Zool.)
   The wels.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Wels \Wels\, n. [G.] (Zool.)
   The sheatfish; -- called also waller.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Waller
    n 1: United States jazz musician (1904-1943) [syn: Waller,
         Fats Waller, Thomas Wright Waller]