Ignota
Ignota means "unknown", in the feminine form, in Latin, and is used in some contexts when the name of a person is unknown. It may refer to:

Elizabeth Clarke Wolstenholme-Elmy who used it as a pseudonym
Plautia (mother of Aelius Caesar), sometimes called "Ignota Plautia"
Lingua ignota ("unknown language"), a mystical 12th-century language created by Hildegard of Bingen