While it’s entirely possible that someone in the world could register one of your shortlisted names, it’s unlikely that one of the survey respondents will be the one to do it.
Domain names are unique, one-of-a-kind assets that are in extremely high demand. On average, there are 18 million domain names registered each year (almost 50,000 per day). In total, there are more domain names registered than there are people in the United States!
If you want to be extra-cautious, register some of the names you like with Namecheap (.com domains currently cost less than $10). However, if you do find that someone else registers your name, we’d be happy to re-run the survey for you at no cost.