Asteroid 129234, Silly, was discovered August 8, 2005 by Bernard Christophe at Saint-Sulpice, Oise, France. It has a period of 3 years, 131 days.
It was named for French businessman and astronomer Didier Silly (born 1950), a long-time colleague and friend of the discoverer.
As Henk Middleraad has pointed out, the meaning of asteroid Silly seems to be what its name might suggest to an English speaker:silly. It could also be a name asteroid for people or places named Silly, such as the town of Silly, Belgium, which is known for its breweries.