@sanjikun Luffy isn't renaming every single technique upon gaining new forms of Haki, but some get new names as they upgrade, especially the stronger or more signature ones.
- Jet Gatling + Armament Haki = Hawk Gatling (not to be confused with Red Hawk, which is the fire version)
- Elephant Gun + penetration Haki = Roc Gun (not to be confused with Red Roc, the fire based version)
- King Gong Gun + penetration Haki + ACoC = Supreme Kong Gun
- King Kong Gun (大猿王銃, Kingu Kongu Gan, literally meaning "Great Monkey King Gun")
大 (dai) – big, great, grand
- Over Kong Gun (覇猿王銃, Ōbā Kongu Gan, literally meaning "Supreme Monkey King Gun")
覇 (ha) – supremacy, domination, hegemony, conquest