hi! not discouraging other responses to your questions (especially the last one, which I don't think has been addressed directly), but FYI there have been a few related posts that you may find worthwhile:

• In Anglo-Saxon England, would people distinguish between Angles, Saxons and Jutes? When did this distinction disappear?

• Why is England named after Angles and not after Saxons?

• Why is it England and not Saxland?

• When did people of Celtic, Saxon, Viking, Jute descent start to consider themselves as one English people?