The Collaborative International Dictionary of English v.0.48:

Ayle \Ayle\, n. [OE. ayel, aiel, OF. aiol, aiel, F. a["i]eul, a
   dim. of L. avus grandfather.]
   A grandfather. [Obs.]
   [1913 Webster]

   Writ of Ayle, an ancient English writ which lay against a
      stranger who had dispossessed the demandant of land of
      which his grandfather died seized.
      [1913 Webster]