The name is basically the word bushel, like for not hiding your light under, but the sh sound was often spelled ss in Latin at that period.
It's not a place, so they never used a "de". They have no connection with any Bossalls of Bossall.
The internet hasn't tried to do the Bussels as such, it's just mangled them to make bogus aristocratic connections for the Houghton and Standish clans.
Warin Bussel wasn't the son of Roger de Busli of Tickhill, who died without heirs.
He didn't marry Montgomery's daughter. That title "Baroness Barnard" says she's the same as Montgomery-3928, often shown as the ancestor of the Balliols of Barnard Castle. Roger's niece really, but some internet trees like daughter better. But that's a different can of worms.
What little we "know" comes from an inquest in 1212, when a jury was paid "expenses" to remember what it was told to remember, from before it was born. No dates were remembered at all.
They said Warin Bussel had granted estates of 5 and 4 and 2 ploughlands to 3 lucky bridegrooms to take 3 daughters off his hands.
Then Richard Bussel had granted similar estates to 3 more men to marry 3 sisters.
None of the brides are named.
In Farrer's mimimal version, Richard is Warin's son, and Warin had 6 daughters.
If you try to guess dates, it looks like there were two wives and two separate clutches. But you could also wonder if there were two Warins, and Richard was the son of Warin junior. Other options are possible, eg Richard's sisters were maternal half-sisters, so not Bussels at all.
Richard had a deed witnessed by two sisters, Sibil and Maud. If they were 2 of the 6, we don't know which. They could be additional to the 6.
Spileman married Richard's sister and left 2 daughters, not necessarily by her. Ralph de Standish is reasonably conjectured to be the son of one of the daughters, or at least the son of her husband, but there's nothing explicit.