O. N. ö, u-v-umlaut of a, becomes æ, written a: daggit, ragweed, tangle.
O. N. ö, u-umlaut of a in originally open syllable, like open a, > ē in spale.
Hence u-umlaut does not appear in loanwords.
ja (ia).
O. N. ja > a in assle-tooth, harn, starn.
> e in sker and stern.
jö (iö).
O. N. jö > a in tarn.
O. N. jö > i before r in firth, gyrth (gjörth), gyrthin.