I can't really comment on your tentative conclusions but it is certainly of interest. I would not be surprised if there were more potential starters of Yarwood/(Y)Earwood lines. At the UK end I am trying to account for names that go missing from my 'one-name' study.It seems almost impossible to equate a sudden gap at this end (UK) with an appearance some years later in the US or wherever. The following may be of interest: i) John Y. was sent as an emmigrant 'in bondage' from Newgate (gaol, in London) to Carolina or Virginia, 21 Feb. 1724 (Source - 'Emmigrants in Bondage 1719-44, author unknown (I got this second hand), published 1967. ii)A ticket was granted to Thomas Y(e)arwood in the barque 'Endeavour' for Carolina (from Barbados) 4 Nov. 1679 (Source: Public Rcd Office, Long Room A/24B). In 1679 there was still a William Yearwood in Barbados and by 1715/6 there were 5 households of Yearwood's and I assume the name was taken up by many of the plantation workers, accounting for the large number of Yearwood names thereafter.I guess quite a number of these could have emmigrated to the US. (Further comment on Richard Y. stepfather of Harvard in reply to Nancy B. below) Bob Yarwood.