Source : Webster's Revised Unabridged Dictionary (1913)

Welaway \Wel"a*way\, interj. [OE. welaway, walaway, weilawey;
   wei wo! (Icel. vei) + la lo! (AS. l[=a]) + wei wo!; cf. AS.
   w[=a] l[=a] w[=a]. See {Woe}.]
   Alas! [Obs.]

         Then welaway, for she undone was clean.  --Wyatt.