What do you think of Floria? Does it sound too much like "floor" + "ia"? Does it seem superfluous in a world where Flora exists? I quite like it—it's rococo but not unapproachable. I don't know much about the opera
Tosca, but an operatic heroine is a rich namesake.
Some combos:
Floria Matilda
Floria Minerva
Floria Helen
Floria Judith
Floria Sabina
Floria Sibyl / Sibylla / Sibilla
Floria Fernanda
Floria Millicent
Floria Constance
Floria Ingrid
Floria Laetitia / Letitia / Letizia
Floria Juliet
Floria Ginevra
Floria Winifred
Floria Henrietta
Floria Celestina
Floria Marguerite