Family search has a record for James Tonken OR Jenkin with a daughter named Elizabeth Tonken or Jenkin. Elizabeth was christened on 15 Feb 1767 in St Just in Penwith, Cornwall. Is it possible that the transcriber couldn't make out the correct surname from the record and how does one find out what the real surname is.
'England Births and Christenings 1538-1975.
: 30 December 2014), James Tonken Or Jenkin in entry for Elizabeth Tonken Or Jenkin, 15 Feb 1767; citing SAINT JUST IN PENWITH,CORNWALL,ENGLAND, reference ; FHL microfilm 226,217, 226,218, 962,681.