I just passed through that and it was difficult. How we solve it:
1st rule everything is allow - no critics
2nd Use a white board (big one)
3rd Invite your friends, family. It will be not only more ideas but fun
Explain your product or service - every word, idea, concept is accepted
The value of it, what will they receive and why they do it: beauty, status
Then start throw names (do not erase the previous concepts), check opposites, have a dictionary or your laptop close to check synonyms, other languages.
Make a final list an based on what you want to communicate choose it.
It will be a nice afternoon