Cumpsty Family History
Cumpsty Surname Meaning
Possibly from Cunsey (Hawkshead Lancs) with an intrusive –t- and labialization of the nasal /n/ although Hawkshead is quite far to the north and the surname has always been concentrated in the Fylde.
A more difficult derivation would be from Compley in Poulton-le-Fylde.
The addition of final /f/ or /v/ is due to hypercorrection i.e. inversion of the change which produces Binkley from Bintcliffe.
Source: The Oxford Dictionary of Family Names in Britain and Ireland, 2016
