How to buy a planet name?

Excuse me, but could you possibly elaborate on the process of purchasing a planet name? I understand it may seem like an unconventional endeavor, but I'm genuinely curious about the steps involved. Does one simply search for available names on an online database? Is there a governing body that oversees these transactions? Additionally, what kind of financial commitment is typically required for such a purchase? I'd appreciate any insights you might have on this unique topic.