From LeanDomainSearch.com [leandomainsearch.com ] comes a study of the top 5,000 domain name prefixes and suffixes.
The top 1,000 queries resulted in 50,076,498 domain names containing 26,050,539 unique prefixes and suffixes (and yes, those 50M domain names represent about half of all registered .com domain names in existence).
The top prefix is my+, which was registered in 983 out of the 1000 domain names checked . . . The top suffix, +online, was registered in 974 out of the 1000 domain names checked . . The 5000th most frequently used result, +vancouver, was registered in 395 out of the 1000 domain names checked. The only results I omitted were single letter prefixes and suffixes because they’re not something you would generally add to generate quality domain names.
Might be worth a rean or scan as it may suss out some insights into what affiliates or MFAs have been targeting.
It may also serve as a guide to domains to (speculatively) register but I suspect most quality speculative domains, following the popular model, have long since been taken.