The Collaborative International Dictionary of English v.0.48:

Well \Well\, v. i. [imp. & p. p. Welled; p. pr. & vb. n.
   Welling.] [OE. wellen, AS. wyllan, wellan, fr. weallan;
   akin to OFries. walla, OS. & OHG. wallan, G. wallen, Icel.
   vella, G. welle, wave, OHG. wella, walm, AS. wylm; cf. L.
   volvere to roll, Gr. ? to inwrap, ? to roll. Cf. Voluble,
   Wallop to boil, Wallow, Weld of metal.]
   To issue forth, as water from the earth; to flow; to spring.
   "[Blood] welled from out the wound." --Dryden. "[Yon spring]
   wells softly forth." --Bryant.
   [1913 Webster]

         From his two springs in Gojam's sunny realm,
         Pure welling out, he through the lucid lake
         Of fair Dambea rolls his infant streams. --Thomson.
   [1913 Webster]