Name from Julie Bourke (nee McColl) in a four-pager titled, “Clark Notes” received by Brian in email dated 10 April 2017. Julie is great-granddaughter of Henry Gosling Clark and Emma Caroline Horneman. Brian of nzolivers.com is a great-great grandson of Emma and Henry Clark.

Julie quotes giving date of birth and of baptism. Note, name is Martha here:
Born Feb.7 1825 Bap. 25 July 1826 Martha daughter Charles Coombes CLARK & Lucy Twickenham Surgeon J.H. Irvine Off. Min N o. 446

Brian of nzolivers.com found her name as “Matilda” in the 1841 Census. However, Brian found her name as “Marth” in the 1851 Census
Names from 1851 Census:
Name Age Occupation
Charles Clark 63 M.R.C. Surgeon
Lucy Clark 66
Lucy E Clark 35
Sophia Clark 33
Alfred Clarke 27 M.R.C. Surgeon
Marth Clarke 25
Henry Clarke 23 Architect

Place of birth, from RobertJones1892 “7A.B. Middx.RV/8MiddxRVC/ 2V.B.Middx.Regiment” public family tree on Ancestry.com in May 2017.