Was Erkembald an early Douglas?

[William Douglas]

Erkembald fitz Erkembald, who had a 'set of the customary' five manors in England seems to have been a progenitor of several families.

Is Erkembald just a common name of the time (C1100) or was he just one person from Flanders who made merry with the women of England and Scotalnd and started one, or several, dynasties?

I have this rather curiously worded entry in the Douglas Archives:
William de Duglas, the first of the family in record, between 1175 and 1199, witnessed a confirmation charter by Jocelin, bishop of Glasgow to the monks of Kelso (Kelso, 454), and was a witness to another charter to the canons of Holyrood by William the Lion about the year 1200 (LSC., p. 44). Between 1204 and 211 William de Duueglas also witnessed a charter by Thomas, son of Thancard, in favor of the Abbey of Arbroath (RAA., I, 99). His son and heir, Archibald (Archabaldus, Archembald, Arkembaid, Arkenbald, Erkembald or Erkenbald) de Duueglas appeurs as a witness to numerous charters in the chartularies of Melrose, Kelso, Newbattle, and Moray.

Erkembald fitz Erkembald appears in the Skidmore/Scudmore family trees and in the Fleming family tree in about 1100.

It is said that the founder of the family came from Flanders, about the year 1147, and was named Theobald the Fleming, and that he received from Arnold, Abbot of Kelso, a grant of lands on Douglas Water (Dhu-Glas), the dark stream, from which the family name was derived. But this is mere conjecture, not supported by any evidence.

Any comments?

[William Douglas]

Archibald was Bishop of Moray in 1274, though no one knows which family he was from. He had a dispute with the Pope.

[Russell Lynn Drysdale]

No answers , but a question ... in 1274 who was the Bishop of Moray