"Why Wheatstone?"

It's "Wheatstone" because it was invented by someone called Christie!

The following is from the IEE News, November 2001:

"Charles Wheatsone's name may be invariably associated with the bridge circuit for electrical measurements, but he did not invent it, nor claim to have invented it. His contribution was to publicise the device in his 1843 Bakerian Lecture to the Royal Society, the first coomprehensive survey of electrical measurement, in which he drew on 'the useful and accurate method of measuring resistances' devised by S.H. Christie"

See Also: http://www.iee.org.uk/Events/s12dec01a.cfm