Hill is a common name. Nothing can be said about it with any degree of certainty. Unless your haplogroup is G2 and you have ancestors in Maryland or West Virginia, of course.
The name Evans was originally Evansen. It was first used by a Danish Viking in reference to a Welsh lad whose father was John.
Location: Glamorgan, South Wales.
Early 11th Century.
Was the "Tribe of Arthur the King" any tribe led by an Arthur, or a specific tribe led by a specific Arthur, out of interest?
We define the nominative as the subject.
Hence the accusative of the nominative is the genetive.
The sign of the bear is the emblem of the King.
If you are a descendant of the King after two direct lines of descendancy (=by the maternal and the paternal line simultaneously) you bear the double emblem of the sign of the bear.
A tradition of long standing.
The history is found in the Indo-European etymology and custom.
Originally borrowed from the Finno-Ugrian neighbours in the early second Millenium BC.
Location: Southern Russia.
In the accusative case the velar (a clusile) component is lost.
If the accusative case assumes the place of the nominative case, the velar component is lost in the nominative case also.
If we discount the dissolvement of the velar the difference is in the line of orthography only.
Arkt-Ursus> Arthurus > Arthur.
Definitely the King.
There was a lot of interbreeding between the Celts and the Vikings at the period.
Also the Norsemen and the Danes interbred.
Hence Atchison is a descendant of Arthur the King.
Across the Norwegian line of the House of course.