WA ai, aye
'always, ever, in each case'(Modern English ay, aye)
cp. OIcel ey, ei ‘always’ < the acc. sg. of PGmc *aiwaz ‘age, time’; cp. OE ā, Go áiw, OFris ā, OS ēo, OHG io. See also ayquere.
the acc. sg. of *aiwaz
Proposed ON Etymon (OIcel representative)
ey, ei 'always, eternally, forever'
(ONP ei (2) (adv.), ey (4) (adv.))
Other Scandinavian Reflexes
Icel ei, e
ā 'always, ever'
Phonological and morphological markers
ON /ei/ < PGmc */ai/
Common since Orrm; widespread in later ME, though apparently more restricted earlier on; MnE dial in N.
Occurrences in the Gersum Corpus
Gaw 26, 73, 128 etc.; Pe 44, 56, 101 etc.; Cl 114, 117, 132 etc.; Pat 8, 90, 130 etc., Erk 278; WA 239, 242, 265
See the remarks in McGee 488-9 on its replacement in some mss of SJ and of Chaucer’s works.