Armance

Variant form of Armande, which was influenced or inspired by Latin, in that French names ending in -ce usually come from Latin names ending in -tius (for males) and -tia (for females). For example: Maxentius became Maxence in French and Constantia became Constance.

With that said, you might want to take a look at the names Hermance and Hermande, which are quite similar in appearance and have the exact same etymology at the root.

Also, it might be interesting to know that there is a river called Armance in France. It is one of the principal tributaries of the Armançon, a river located in the Burgundy region of France. Both their names are said to be of Celtic (or Gaulish, if you will) origin.

Finally, in literature, Armance is the title of an 1827 romance novel written by Stendhal (1783-1842). The novel derives its name from Armance Zohiloff, one of the principal characters in the novel.