Amanda - your use of a swan will probably be just visual then.
Word-wise there is not much I can think of that wouldn't be too long for trading /practical purpose. The connotations I get from swan include:
Black
Mute
Whooper
Cygnet
Down
The Ugly Duckling
Swan Lake
Swan Neck
Swan Upping
and Swan Vesta
Not much of a match there, I am afraid. Wish you good luck with your business though.