The top 10 trending keywords registered in .COM and .NET domain names during the month of June 2019 were published by Verisign, the .com and .net registry.
You can find the list from last month here.
My experience shows that 700 or 800 (or even less) domain registrations are enough to bring a keyword into the top 10.
There is one common keyword in the .com and .net lists: Libra.
Libra is Facebook’s newly announced cryptocurrency.