The second son of Benoit and Anais de Faepoix. Anais, adamant she was to have a girl, was severely disappointed when her second child turned out to be a boy. Determined to still use the name that she put so much time and thought into, Ottilie Blanche de Faepoix so named.
A name much hated in his younger days. As he aged he learned to accept the feminine name as something that was uniquely his. The cases of mistaken gender, though, truthfully somewhat grating over time, were amusing.
In his time before leaving Ishgard, most knew his as "Otti" a simple nickname to try to put a masculine spin on the very feminine name.