Lulu/Loulou/Lola Yaara* for a (fictional) twin sister to Anaïs Yasmina/
*Yaara means Honeysuckle as I want a highly scented flower middle name for both: open to other suggestions.
Lulu/Lola etc to reference Lilith/Lilitu indirectdly.
Unless Colette a better match with Anaïs as a "courtesan" name (given Anaïs references Anaïs Nin; there is a vageuly smilar late 19th/early 20th C libertine French author called Colette.)