Question: What former Governor of New Zealand proclaimed and named one of the 49 South Australian counties after an early Australian explorer?

Context articles: George Grey
History of New Zealand
Electoral division of Millner
County of Gawler
County of Sturt
Oxley, Queensland
Division of Wentworth
Tennis New Zealand
Division of Blaxland
County of Grey

Sir George Grey, KCB (14 April 1812 – 19 September 1898) was a British soldier, explorer, Governor of South Australia, twice Governor of New Zealand, Governor of Cape Colony (South Africa), the 11th Premier of New Zealand and a writer.
 By political philosophy a Gladstonian liberal and Georgist, Grey eschewed the class system for the prosaic life of Auckland's new governance he helped to establish.
The history of New Zealand dates back at least 700 years to when it was discovered and settled by Polynesians, who developed a distinct Māori culture centred on kinship links and land.
 The first European explorer to sight New Zealand was Dutch navigator Abel Tasman on 13 December 1642.
 The Dutch were also the first non-natives to explore and chart New Zealand's coastline.
 Captain James Cook, who reached New Zealand in October 1769 on the first of his three voyages, was the first European explorer to circumnavigate and map New Zealand.
 From the late 18th century, the country was regularly visited by explorers and other sailors, missionaries, traders and adventurers.
 In 1840 the Treaty of Waitangi was signed between the British Crown and various Māori chiefs, bringing New Zealand into the British Empire and giving Māori the same rights as British subjects.
 There was extensive British settlement throughout the rest of the century and into the early part of the next century.
 War and the imposition of a European economic and legal system led to most of New Zealand's land passing from Māori to Pākehā (European) ownership, and most Māori subsequently became impoverished.
Millner was an electoral division of the Legislative Assembly in Australia's Northern Territory.
 One of the Legislative Assembly's original electorates, it was first contested at the first election in 1974.
 It was named after the suburb of Millner, which in turn was named for James Millner, a doctor and early Australian explorer of the Northern Territory who drowned on the "SS Gothenburg" tragedy.
 It was abolished in 2008 and replaced with the new electorate of Fong Lim.
 Millner was an urban electorate, and at its abolition covered 22.74 km², taking in the suburbs of Millner, Coconut Grove, Ludmilla and part of Rapid Creek.
 There were 4434 people enrolled in the electorate as of June 2005.
The County of Gawler is one of the 49 counties of South Australia.
 It was proclaimed by Governor George Grey and named for the former Governor George Gawler.
 It is bounded by the Wakefield River in the north, Gulf St Vincent in the west, the approximate path of Horrocks Highway in the east, and the Gawler River in the south.
The County of Sturt is one of the 49 counties of South Australia.
 It was proclaimed by Governor George Grey in the 1840s and named for early Australian explorer, Charles Sturt.
 It stretches from the Bremer River and eastern slopes of the Adelaide Hills at Nairne and Tungkillo to the Murray River in the east and in the south, the portion of Lake Alexandrina north of a line from Point Sturt to Pomanda Island.
 This includes the west-of-river parts of the contemporary local government areas of the Mid Murray Council and Murray Bridge City.
Oxley is a south-western suburb in the City of Brisbane, Queensland, Australia.
 It is located approximately 10.8 km from the Brisbane CBD.
 It was named after the early Australian explorer John Oxley.
 The suburb supports a mix of residential, retail and industrial land.
The Division of Wentworth is an Australian electoral division in the state of New South Wales.
 It was proclaimed in 1900 and was one of the original 75 federation divisions contested at the first federal election.
 The division is named after William Charles Wentworth (1790–1872), an Australian explorer and statesman.
 In 1813 he accompanied Blaxland and Lawson on their crossing of the Blue Mountains.
The history of tennis in New Zealand dates back to the 1870s, the decade when the development of modern tennis began.
 The first "New Zealand Tennis Championships" were played at Farndon in Hawkes Bay in 1886.
 New Zealand Lawn Tennis Association (NZLTA) was formed at a meeting held in Hastings in December 1886.
 Shortly after its inauguration, the New Zealand Association became affiliated with the Lawn Tennis Association (England).
 In 1904 New Zealand Lawn Tennis Association amalgamated with six Australian state tennis associations to form the Lawn Tennis Association of Australasia.
 New Zealand Lawn Tennis Association played a significant role in the origin of the Australian Open.
 Lawn Tennis Association of Australasia created the tournament called "The Australasian Mens Championships" (which later became Australian Open) in 1905 and was first played in Warehouseman's Cricket Ground and it was decided that championships would be hosted by both Australian as well as New Zealand venues.
 New Zealand hosted the championship twice— Christchurch (1906) and Hastings (1912).
 The geographical remoteness of both the countries (Australia and New Zealand) made it difficult for foreign players to enter the tournament.
 In Christchurch in 1906, of a small field of 10 players, only two Australians attended, and the tournament was won by a New Zealander (Tony Wilding).
 Lawn Tennis Association of Australasia was one of the twelve national associations of tennis which established the International Lawn Tennis Federation (ILTF) in a conference in Paris, France on 1 March 1913.
 From 1905 until 1919, New Zealand and Australian tennis players participated in the International Lawn Tennis Challenge (Davis Cup) under the alias of "Team Australasia", the team claimed a title six times (1907, 1908, 1909, 1911, 1914, 1919), however, there were attempts to severance this trans-tasmanian partnership, in order to allow New Zealand players to represent their nation on international tennis events.
 In 1922, New Zealand dropped out from this partnership and on 16 March 1923 New Zealand Lawn Tennis Association was granted affiliation to the International Lawn Tennis Association and thereby became eligible to enter the International Lawn Tennis Challenge in its own right.
 New Zealand Lawn Tennis Association filed its first challenge with United States Lawn Tennis Association for 1924 International Lawn Tennis Challenge.
 Tennis New Zealand was the founding member of Oceania Tennis Federation in 1993.
The Division of Blaxland is an Australian electoral division in the state of New South Wales.
 The division was created in 1949 and is named after Gregory Blaxland, a farmer and an early Australian explorer of the Blue Mountains in New South Wales.
The County of Grey is one of the 49 counties of South Australia.
 It was proclaimed in 1846 by Governor Frederick Robe and named for former Governor George Grey.
 It covers the extreme south-east of the state from Penola and Lake George southwards.
 This includes the following contemporary local government areas of the state: