How do you A/B test product names (or domain names)?
What criteria do you use to qualify the choices at hand?
Some common ones are "be a two-syllable word" and "hard to mistype". But there are other, less obvious ones. For example, I've found sometimes that somewhat controversial and/or non-intuitive names end up being more sticky than something that's easy to get at first but less memorable in the end.
Also, what sample size have you found sufficient to go with the winner?
I’m having the same things going through for myself as well. Few criteria to follow for choosing domain name:
If you get to follow these rules, the domain name may be valuable which you can sell it at a better price in future. You can use godaddy appraisal tool to get some insights of how much your desired domain is worth (https://my.godaddy.com/domain-value-appraisal)