I still haven't found Hilburn Swilling, which oughtn't to be difficult if he is out there!
Not much success tracing the name itself, either.It does not appear in the Oxford Dictionary of English Surnames.If it is not a variation of some Continental name, perhaps it derives from the placenames Swilland (Suffolk) or Swillington (W. Yorks.), both of which were settlements having to do with pig farming.
It is also barely possible that it is an Englishing of the Irish Sweeney, which itself is more properly Suibhne in Irish.