All members of the family/clan etc would not be listed. The list I referred to earlier is shown with a few more names at
Below is the explanation from that site:
Companions of Duke William at Hastings
A combination of all the known Battell Abbey Rolls, including Wace, Dukes, Counts, Barons, Seigneurs who attended William at Hastings.
These were the commanders. They were the elite who had provided ships, horses, men and supplies for the venture. They were granted the Lordships.
The list does not include the estimated 12,000, Standard bearers, Men at Arms, Yeomen, Freemen and other ranks, although some of these were granted smaller parcels of England, some even as small as 1/8th of a knight's fee.