It's possible:
* It's a new or niche brand: You may have stumbled upon a lesser-known manufacturer.
* There's a misspelling: It's possible you've misremembered the name. Are you sure it's "Ruko"? Maybe it's a similar sounding brand like "Ryze" or "DJI."
* It's a private project: The drone might be a custom-built or modified model, not available commercially.
To get more information, I need more context:
* Where did you encounter this drone? (e.g., a website, social media, a store)
* What kind of drone is it? (e.g., toy drone, professional drone, specific model)
* Do you have any images or specifications?
With more details, I can help you find information about the Ruko drone or identify a similar model.