8.3.1807 dine at Plunket's, w. Dolland
The only example of this name in Godwin's diary. Nearly all the Dollands in directories were of the Dollond optician family (DNB per.1750-1871), very often spelt Dolland. Old Bailey 15.2.1804 Barnard Dollond cheese and ham dealer 89 Strand. The guests at Plunket's were mostly Irish and the name Dolland was not unknown in Ireland but I found no likely candidates.
20.2.1807 call on Philips, adv. Ring
Quite likely John Ring 1752-1821 doctor and author. His will PCC 18.5.1822. Morn Post 12.11.1821 died 7.11.1821 age 69. In 1807 his "Beauties of the Edinburgh Review, the Stinkpot of Literature" was published
John Flather has a person record in GD website and all Flather and Flathers entries are coded to it except 22.2.1807 and 5.1.1809 both Jas Flather and 25.8.1810 Flather senr
A rare name spelt like this (as opposed to McCoy), but did exist, for example Ann Mackoy widow of St Martin i t Fields will PCC 24.7.1800 but she had no Mackoy heirs. No clear identification
4.2.1807 dine at Hawthorn's; invités Ruthven
Mentioned only once in Godwin's diary and as someone invited but who didn't come. Very likely Edwrad Southwell Ruthven (DNB 1772?-1836) who had just entered parliament and was a Whig supporter
Only mention in Godwin's diary. Could have come in the company of any of the other guests, Hazlitt, Dawe, the Flathers or Godwin's nephew William Godwin. An uncommon name except in Kent, Sussex and Hampshire. Some London examples in work notes below
Bartholomew Parr (1751-1810) MD of Exeter, his will PCC 1811 Exeter Flying Post 22.11.1810 died 21.11.1810 in 60th year. Essays philosophical and chemical 1799, Life of Richard Hole 1803