And just for history buffs, the earliest reference to Otautau I could find in the PapersPast website is this letter to the editor in the Invercargill Times.
The gold diggings at Wakatipu were the big story of the day in 1862. Roads were very rough and accommodation scarce. This writer is saying there's a better way for Southlanders to get to the diggings because there are accommodation houses at Otautau and Wrey's Bush. (click on the picture to enlarge)
Source: Invercargill Times, 28 Nov 1862, p.2.