Why is this Joke?
On March 1, 2010, Topeka Mayor Bill Bunten issued a proclamation calling for Topeka to be known for the month of March as “Google, Kansas, the capital city of fiber optics.” The name change was inspired by a previous name change in 1998 to “Topikachu” in honor of the Pokémon franchise.[7] This was to help “support continuing efforts to bring Google’s fiber experiment” to Topeka, though it was not a legal name change. Lawyers advised the city council and mayor against an official name change.[8] Google announced that it would change its name to Topeka to “honor that moving gesture” at 1 am on 1 April 2010 / via Wikipedia
“Google Changed its Name to to Topeka | April Fools Joke“