Why do you think this name has to be a pet form of a longer name like
Bob?
Ian Fleming's
James Bond novels are full of characters with names like Pussy Galore, Octopussy, and Plenty O'Toole, which are chosen for their sexual connotations and are not necessarily based on any other name.
I would expect that the first name of the character Kissy Suzuki was created by
Ian Fleming from the word "kiss" and was not meant to be a short form of another name at all, but a nickname based on the fact that
James Bond (and other men) would like to kiss her.