Saint Joanna, yes. Johanna, no. Joanna was the wife of Chusa who was the steward of King Herod.
Yes, Johanna is a saints name. It is the Spanish and German form of Joanna or Joan, which are derived from the Hebrew name Yochanan meaning "God is gracious." There are several saints named Johanna recognized in the Christian tradition.
There is a saint named Saint Joanna the Myrrhbearer who was married to Chusa, the steward of Herod and a disciple of Jesus. However, she is not shown to have any patronages.
Nicholas of Myra was the only son of wealthy Christian parents named Epiphanus and Johanna.
He was the only son of wealthy Christian parents named Epiphanus and Johanna. Since he was a Catholic bishop he had no wife or children.
According to the Eastern Church, Nicholas was the only son of wealthy Christian parents named Epiphanus and Johanna. There is, however, no confirmation of this.
Johanna Ray's birth name is Johanna Bennett.
Johanna Sinisalo's birth name is Aila Johanna Sinisalo.
Johanna Skogman's birth name is Johanna Maria Skogman.
Johanna Selbach's birth name is Johanna Katarina Selbach.
Johanna Spyri's birth name is Johanna Louise Heusser.
Johanna Steiger's birth name is Johanna Steiger-Antos.
Johanna Telander's birth name is Johanna Kristiina Telander.