It seems to tick several boxes, though none of them would be mine.
Occupation name. Not as blatant as Naval Officer, but clearly a pointer.
And the Navy is inseparable from the
Ocean, where we find
Coral and a
Marina.
Colour name. Like
Indigo and
Scarlett.
Cutesie diminutive. Not that it's actually short for anything, but it has the look and the sound.