Of course, the dandy lover would have paid for the scent to be made expressly for the mistress--and perhaps a bottle for himself! In the early 19th century, there were no "off the peg" scents and all scents were bespoke perfumes for wealthy clients.
I like this Web site for all the names of the scents. These two perfume houses have authentic pedigrees. I dislike it when perfume houses put out a fausse noblesse and claim to have made perfumes for wealthy clients and aristocrats, or a create false "coats of arms" and trademarks. It is all part of a marketing campaign.
Even one famous courtesan that I have mentioned, Marie Duplessis, was born Rose Amandine Plessis, adding the more classy "du" to her name.