The story
From Shawn + -a. Doublet of Ivana, Jana, Jane, Janice, Janis, Jean, Jeanne, Jen, Joan, Joanna, Joanne, Johanna, Juana, Shavonne, Sian, Siobhan, Shane, Shaun, Shauna, and Sheena.
Etymology from Wiktionary, CC BY-SA 4.0.
Shawna
Today it means: A female given name, variant of Shauna. Full definition →