While no official scientific body recognizes these names, companies like International Star Registry offer similar "ownership" experiences for celestial bodies where you receive a certificate of authenticity and a map.
While you cannot legally own a real cloud in the sky because they are ephemeral water vapor and not recognized as property, you can "buy" them symbolically through novelty services or create your own artistic cloud experiences. 1. Symbolic Ownership and Naming buy a cloud in the sky
A Guide to Entice Heads Into the Clouds - The New York Times While no official scientific body recognizes these names,
Make Sunsets offers the purchase of "cooling clouds" (reflective particles) launched into the stratosphere to help offset carbon footprints. 4. Create Your Own Cloud at Home buy a cloud in the sky