Execution layer scheme: City names
Consensus layer scheme: Star names
Merge is about EL and CL coming together, therefore a “merge” or “compromise” between cities and stars would be a logical choice. What’s between the earth and the stars? We got the athmosphere, planets, solar system, asteroids, etc. (the only nearby star would be our sun but I think we’d all oppose calling the update “SOL”). Continuing that train of thought maybe “Horizon” would be a cool name? “The Horizon fork”, all about going beyond the horizon. I dunno. Kinda fits with earlier fork names like Homestead and Frontier.
Otherwise take the name of a fictional city from SciFi that’s settled somewhere in space?