I actually looked into this about 8 years ago. I can't really recall what I thought of it at the time. With the circle, it makes the Nabisco logo, and the European sign of quality.

https://en.wikipedia.org/wiki/Nabisco

William Moore, Adolphus W. Green, and John G. Zeller, founders of the National Biscuit Company in 1898

https://www.thoughtco.com/history-of-the-oreo-cookie-1779206

So where did the "Oreo" part even come from? The people at Nabisco aren't quite sure anymore. Some believe that the cookie's name was taken from the French word for gold, or (the main color on early Oreo packaging).