I see that the origins of the history of Deacons has been recorded on their website:
"The firm takes its name from a young English solicitor, Victor Deacon, who arrived in the burgeoning British colony of Hong Kong in 1880 to join the legal practice established by William Bridges in 1851.
Within two years, the irrepressible Victor Deacon was made a partner and within 20 years, under his own name, he had firmly established Deacons as one of the colony's leading law firms, a position it has retained to this day"http://www.deacons.com.hk/
William Henry Brereton QC
In 1861, William Henry Brereton QC (born Dublin 1824) joined the law firm of Henry Charles Caldwell (Notary Public) in Hong Kong. W H Brereton became partner & a Notary Public and the firm was known as 'Caldwell and Brereton'.
In 1871, after Charles Henry Caldwell left Hong Kong the firm was known as 'Brereton and Wootton'.
His official papers are held in the Jardine Matheson archive at Cambridge University.
According to the member profile of Deacons on the link below for the Hong Kong Chamber of Comerce-
"The firm's namesake, Victor Deacon, arrived in Hong Kong aboard the Peninsula and Oriental steamship "Ravenna" on July 7, 1880.
The 33-year-old solicitor joined the partnership of Messrs Brereton and Wotton, a direct continuation of Bridges' original practice. While it had been just 19 years since Bridges' departure, much had changed and the practice was now one of four firms of solicitors that were flourishing in Hong Kong.
In just two years, he had quickly become respected as one of Hong Kong's leading conveyancers, and in 1882, Mr Deacon was admitted as a partner, thus adding his own name to the firm's."
http://www.chamber.org.hk/en/membership/profile_detail.aspx?profile_id=21