Unknown first name of male, date of birth, from a document “Descendants of Charles Coombs (Dr.) Clark” received from Linda Burge in an email dated 4 June 2017. Linda’s great-grandmother’s (Frederica J Horneman) sister (Emma C Horneman), married Henry G Clark (b.1827).

Linda emailed a clipping from Paperspast on 4 June 2017:
MARLBOROUGH EXPRESS, VOLUME XXX, ISSUE 110, 11 MAY 1894
Hillman.— On the 10th inst., at Blenheim, the wife of H. Hillman of a son.

Brian of nzolivers.com has found a marriage notice for ‘Percy Montague Hillman’, a son of the late Mr Harry Hillman:

MARLBOROUGH EXPRESS 9 JUNE 1915
MARRIAGE.
HILLMAN—DODSON.—On June 2, 1915, at the bride's residence, by the Rev. W. Wollstein: Percy Montague Hillman, son of the late Mr Harry Hillman, to Geraldine 'Gladys Dodson, youngest daughter of Mr G. L. Dodson, of Spring Creek.

Brian is making the unknown son of Harry Hillman as “Percy Montague Hillman”

Place of birth, year and place of death, from research file07 in June 2017.

Brian subsequently realised Percy is the grandfather of Mary Simpson whom Brian started corresponding with in May 2017!
Brian checked the email received from Mary on 20 May 2017:
It's great to get your email and find that you are close by. I can see from your fan chart that we not only share Horneman great, great grandparent links but also Dodson links.
My grandmother on my mother's side was Geraldine Gladys Dodson. Her parents were Elizabeth and George Lewis Dodson. George Lewis was a son of George Dodson. I too have traced back to Isabella Reid and Joseph Dodson.
My Horneman links are through my grandfather on my mother's side. He was Percy Montague Hillman and his mother was Florence, Edith, Elvira Clark. She married Harry Hillman. Florence was a daughter of Emma Caroline and Henry Gostling Clark.

New Zealand Electoral Roll - Marlborough General Roll for 1946, found in June 2018:
Hillman, Percy Montague, Francis Street, Blenheim, mechanic
Hillman, Geraldine Gladys, Francis Street, Blenheim, married [Wife]
Hillman, Norah Joan, Francis Street, Blenheim, spinster [Daughter]
Hillman, Geraldine Florence, 30 Francis Street, Blenheim, spinster [Daughter]