Change label of "Sprint" to "Hike", or a word that suggest something less hectic.
The word "Sprint" suggests a hectic time within a Sprint timebox.
We coach teams to act professionally, slice work into smaller pieces and work with sustainable pace towards the Sprint goal. This contradicts with 'sprinting'.
For people outside of a Scrum Team it sends the message of busyness.
Scrum is formally translated into over 30 languages, and used in many more cultures.
Don’t try to wordsmith. In the United States, “hikes” start the play in football and a creators of chaos. Much more chaotic than formally structured “Sprints” with start/end and formal lines.
Richard Wellum commented
How about "Iteration" - which implies that further iterations will build on what has already been delivered. This might discourage the "6 month Gantt chart" multi-sprint planning as well!
Sprint really sucks as a name though. Sprinters by definition leave nothing in the tank, and expend all their energy in an initial burst of unsustainable energy. Sprinters physically go into anabolic respiration, leaving themselves a debt of oxygen, and needing slow down or stop to recover; is it any wonder that Scrum sprints often result in rushed implementations and technical debt, go slower and slower, and eventually end up with "refactoring sprints" or bug bashes to recover?