i will be honest and say that we didn't do our due diligence here (we simply assumed that it would be okay to do so, given the existence of GitHub, GitLab, GitKraken, GitButler, and so forth).
it does look like from digging in: https://public-inbox.org/git/20170202022655.2jwvudhvo4hmueaw...
that portmanteaus are prohibited by the policy that the Git PLC enforces, which as Jeff notes in his email above, does grant incumbent advantages to grandfathered names (e.g., GitHub, GitLab).
we'll reach out to the conservancy, ask for explicit permission, and if not, rebrand.
> For the reasons given the Court finds and concludes that (1) McDonald's is entitled to enforce its family of marks that are characterized by the combination of the prefix "Mc" with a generic word; (2) the name McSleep Inn is likely to cause an appreciable number of the public to be confused by believing that McSleep Inn is sponsored, associated, affiliated, connected, or endorsed by McDonald's; and (3) the adoption and use by Quality International of the name McSleep Inn was a deliberate attempt to benefit by the good will and reputation of McDonald's. Therefore, the Court will find trademark infringement, unfair competition, and dilution under the Illinois statute (Ill.Rev.Stat. Ch. 140, § 22).
https://law.justia.com/cases/federal/district-courts/FSupp/6...
I suppose it's not surprising that Europe is less favorable to frivolous trademark claims made by American corporations than America is.