Buckingham

23.11.1807 Buckingham calls / 1.3.1827 Hodgets' au soir, w. Buckingham / 24.10.1828 call on Buckingham / 29.10.1829 theatre, adv. Buckingham / 4.6.1830 dine at H Bulwer's, w. Buckingham
The later entries 1827 to 1830 were perhaps James Silk Bockingham (DNB  1786-1855), at a period when he was active in London journalism. In 1807 he was lately married and penniless might well have called on Godwin between his voyages. other possibles in work notes below.
 

Work notes: 
Holdens directory 1811 (court) Edward B 71 Warren-st Fitzroy-sq / Mr Edward B Crosby-row Walworth (trades) David B engraver 59 Chamber-st / E & F B ropemakers Middle-row Bloomsbury / H B japanned chair manf. 20 Old George-st Mint / James B boot & shoe maker 6 Union-st London-row St George's-fields / Samuel B painter plumber & glazier 47 Bunhill-row / Thomas B pewter manf 24 Swallow-st Piccadilly / William B brush manf 13 St Albans-st Pall-mall