To truly name a Oklahoma team that reflects the state would be to incorporate and indian tribal theme. Thunderbird or Thunderbirds works because it does have some native american history behind it. But the only the I could think of would be too long. Like Tribal Nation or OKC Nation Or Oklahoma Nation etc but that doesn't seem to fit.
Thunder does fit. While thunder happens everywhere I have never been anywhere else where the thunder is so loud it will shake windows etc. Oklahoma gets some nasty thunderstorms. Oh and I love watching the lightning during a storm! I miss Oklahoma!!!!!