There are several questions concerning Google Domains product but no google-domains tag. One of them even contains a remark
FWIW I'd like to tag this "google-domains" and/or similar but I don't have enough rep on webmasters yet.)
Tagging these with [google] and [domains] doesn't seem advisable because most questions with this tag combination are about the effects of domain choice on Google rank. So I propose that google-domains tag be created.