OK- More on George:
Facts about: Uranus
Quote:
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Uranus was not correctly identified as a Planet until march 1781 when the English astronomer William Herschel correctly identified it, he named it "Georgium Sidus" in honour of King George III. The Planet was not commonly known as Uranus until the mid 19th century when it was deemed more in keeping with the names already given to the other Planet's to re-name it Uranus at the suggestion of the German astronomer Johann Elert Bode 1747–1826.
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So I'm going to change my earlier assumption and guess it was called Georgium for about 40-80 years. (Probably dependant on where you were at the time)
There doesn't seem to be a definite date but it looks as if it was also known a Herschel for a time as well