The Collaborative International Dictionary of English v.0.48:

Bayard \Bay"ard\, n.
   1. [OF. bayard, baiart, bay horse; bai bay + -ard. See Bay,
      a., and -ard.] Properly, a bay horse, but often any
      horse. Commonly in the phrase blind bayard, an old blind
      horse.
      [1913 Webster]

            Blind bayard moves the mill.          --Philips.
      [1913 Webster]

   2. [Cf. F. bayeur, fr. bayer to gape.] A stupid, clownish
      fellow. [Obs.] --B. Jonson.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Bayard
    n 1: French soldier said to be fearless and chivalrous
         (1473-1524) [syn: Bayard, Seigneur de Bayard,
         Chevalier de Bayard, Pierre Terrail, Pierre de
         Terrail]