Blethyn Family History
Blethyn Surname Meaning
From the Middle Welsh personal name Blethyn, Old Welsh Bledgint is derived from bleid ‘wolf’ + the mutated form (apparently) of cint ‘first’.
The variants in P- are from ap Blethyn in which /bp/ was assimilated to /p/.
Source: The Oxford Dictionary of Family Names in Britain and Ireland, 2016
