All the names do have some historic sense and roots in Oklahoma. Thunder because the area is prone to violent storms. Barons would be named after the cattle barons, most famously in Texas and Kansas, but in order to get to the rail depots in Dodge City and Abilene, Kansas from Texas the long cattle trains would have to go through the Indian territory(now since named Oklahoma). Bison would be named after the long hair native animal of the Great Plains. Energy would be named after both the violent storms and the new bio-fuel industry taking place in Oklahoma. Finally, Marshalls would also go back to the states cattle days, as well as be a reminder of the wild west which the lower plains became famous for.