Er lijkt aansluiting te zijn bij deze persoon Farquhar Mackenzie op wikitree.com. Ik citeer 'highlights':
Farquhar Mackenzie (1811 - 1874) [ Als dit klopt is hij een paar jaar ouder dan Hector - die overigens hier niet als broer is genoemd. Herkenbare namen zijn wél een broer Alexander, opa Alexander, een zoon Hector en een oom Hector]
On route to Batavia. Travel 13 JUL 1830.
Departure 29 MAR 1830. Liverpool, England. Arrival 14 AUG 1830. Batavia, Java.
Departure 6 OCT 1836. Batavia
Bronnen:
↑ Source: #S611 Saturday 26 November, 1836; pg.2; From Batavia, same day,the ship Thomas Harrison, but detained from entering the Cove until a Medical Enquiry takes place, in consequence of some sickness, supposed to be the Java, fever having occurred during the passage; particulars are consequently not known. Link: http://nla.gov.au/nla.news-article2207976
↑ Source: #S610 Monday 28 November, 1836; pg.2; From Batavia, on Friday last, having sailed on the 6th of October, the ship Thomas Harrison, Captain Harrison, with sugar, &c. Passengers, J. Northwood, Esq., and F. M'Kenzie, Esq. Link: http://nla.gov.au/nla.news-article12857733

Zie ook hier, http://www.fullbooks.com/History-Of-The-Mackenzies8.html
History Of The Mackenzies by Alexander Mackenzie
Over de vader van deze Farquhar, Kenneth:
"3. Kenneth, who was born on the 14th of February, 1765, was a Captain in the army, and served in India, where he was at the siege of Seringapatam. He soon after retired from the service, and settled down as a gentleman farmer at Kerrisdale, Gairloch.
He married Flora, daughter of Farquhar Macrae of Inverinate, with issue, three sons and four daughters -
(1) Alexander, a Captain in the 58th Regiment, who married a daughter of William Beibly, M.D., Edinburgh, with issue;
(2) Hector, a merchant in Java, where he died, unmarried;
(3) Farquhar, a settler in Victoria, where he married and left issue - Hector, John, Violet, Mary, and Flora;
(4) Jean, who married William H. Garrett, of the Indian Civil Service, with issue - two sons, Edward and William, and four daughters, Eleanor (now Mrs Gourlay, The Gows, Dundee); Flora, Emily, and Elizabeth;
(5) Mary, who married, first, Dr Macleod, Dingwall, without issue and, secondly, Murdo Mackenzie, a Calcutta merchant, also without issue;
(6) Christian Henderson, who married John Mackenzie, solicitor, Tam, a son of George Mackenzie, III. of Pitlundie, with issue--two sons, both dead, one of whom left a son, Charles;
(7) Jessie, who married Dr Kenneth Mackinnon, of the Corry family, H.E.I.C.S., Calcutta."
Voor wat betreft William: hij zou een zoon zijn van SIR HECTOR MACKENZIE. Deze Hector had de volgende nakomelingen:
1. Francis Alexander, his heir and successor.
2. William, a merchant in lava, and afterwards in Australia. He died, unmarried, in 1860, at St. Omer France. [ Dat zou nagetrokken moeten worden. Want wie is anders de William die in 1852 in Padang is overleden? We hebben in Indië een William die een zoon Francis Alexander heeft!!]
3. Hector, who married Lydia, eldest daughter of General Sir Hugh Fraser of Braelangwell; was Captain in H.E.I.C.S., and died in India, without surviving issue.
4. Dr John, of Eileanach. He studied for the medical profession, and took his degree of M.D.
=> In beide takken, de afstammelingen van Kenneth en Sir Hector zijn de overeenkomsten in namen (= vernoemingen) met de Mackenzies in Nederlands Indië, zowel degenen die daar vanuit Groot Brittanie arriveren, als degenen die daar worden geboren zó treffend dat verwantschap wat mij betreft zeker is. Het gaat er nu om alles na te trekken, en te achterhalen 'who is who'. 2 Hectors die gemakkelijk zouden kunnen worden verwisseld, en een William verhaal waarover ik in ieder geval mijn sterke twijfels heb gezien de namen van de William nakomelingen op Java.