Perhaps try PULSFORD as a surname variant.
Thank you for the suggestion.
There is a baptism for a Catharine PULSFORD on 28th May 1727 at Sandford, which is Mid Devon, a little North of Crediton.
The register shows the previous baptism, 3 days earlier, was for a George Pulsford, and I hazard the fathers are likely to be close family members, both living in the village of Sandford.
There is a marriage on 8 July 1753, for a Katherine PULSFORD to Richard Isaac, (both of Ashreigney,) at Dowland. The map suggests Dowland is approx 30k NW of Sandford.
Therefore I am guessing this is probably not the Catharine Pulciver I am seeking, but will welcome any opinions.