The Collaborative International Dictionary of English v.0.48:

Scrawl \Scrawl\, v. t. [imp. & p. p. Scrawled; p. pr. & vb. n.
   Scrawling.] [Probably corrupted from scrabble.]
   To draw or mark awkwardly and irregularly; to write hastily
   and carelessly; to scratch; to scribble; as, to scrawl a
   letter.
   [1913 Webster]

         His name, scrawled by himself.           --Macaulay.
   [1913 Webster]