Term "Roulette" is French & essentially it means the "small wheel". Whereas it might appear that as "Roulette" is the French word game itself generally comes from France, however it is not essentially true. Also, there many differing theories that are ranging from game originating at China and ancient Rome. Many that believe this game originated from China, think Dominican Monks were trading with Chinese brought game back to the mainland Europe. Roman theory is totally based on the accounts, which Romans will tip the chariot wheels as well as spin them as the form of fun.
Bit more famous theory is that French scientist Pascal, credited with probability theory, and invented roulette wheel. It was by product of his many experiments. Eventually, at 1842, French brothers Francois and Louis Blanc invented roulette game that we know now. They also invented "0" version that is used by many countries in world. The legend about Blanc, is he apparently sold soul to devil to obtain secret of the roulette. The conspiracy theorists validate the story by a fact that all numbers on the roulette wheel actually added to "666".
Although Blanc brothers' game was the resounding success, and gambling was illegal in France thus it was been introduced at Hamburg instead. The gambling was banned eventually at Germany as well, but, but Prince of Monaco then invited Louis for operating his Monte Carlo casino as well as reacquaint people with this game of the roulette.
While brought on to America, "0" version of the roulette was been abandoned in the favour of "00" version of the roulette. Now, to distinguish between the 2 variations, "00" version is named as American Wheel whereas "0" version is European Wheel. "00" version has around 38 numbers whereas "0" version just has thirty seven but, in spite of the differences, both of them are very popular all over the world.