Jahn
- Full Name: Jahn
- Born: Kelvan scout craft, intergalactic space (TOS: "By Any Other Name")
- Species: Kelvan
- Mid-23rd century: Resident, Kelvan scout craft (TOS: "By Any Other Name")
- Early 2268: Arrival in Milky Way Galaxy from Kelvan Empire (TOS: "By Any Other Name")
- 2273: Resident; New Kelva (SCE Short Story: "Foundations, Book Three")
- By 2280: Participation with SCE on transwarp development (SCE Short Story: "Foundations, Book Three")