Since Old English is quite closely related to Old Frisian, we should also take into account the possibility that the king's name is etymologically related to the masculine Frisian given name
Anne:
https://www.behindthename.com/name/anne-2 (I was unable to link to this specific entry in the usual way on BtN)
Also see:
https://en.wikipedia.org/wiki/Anglo-Frisian_languages (in English)
Forchta in biuonga quamon ouer mi, in bethecoda mi thuisternussi.
In ic quad: "uuie sal geuan mi fetheron also duuon, in ic fliugon sal in raston sal?"