Annie
A name suggestion: Coda
Dictionary definitions:
1. Music. the concluding passage ...
2. Ballet. the concluding section of a dance.
3. a concluding event or series of events.
Those seems to fit the boat's design brief.
It could hardly be shorter. That saves on sign writing.
It has two good clear syllables for use on the radio, or for hailing.
It is generally pronounced correctly.
C O D A is not, as far as I am aware, an abbreviation and does not, as far as I am aware, have any unfortunate connotations.
It could have a certain wistful sadness, which might not be acceptable.
However, the association with music and ballet may suggest delight and gaiety (in its original sense).
Jonathan