Around the globe, Sionneau (Sionneau 
) is an extremely rare unknown gender first name. Much more frequently, Sionneau is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Sionneau | Spain, United States, Afghanistan, France, Brazil |
Mr, Annie, Chani, Candy, Colin, Cyril, Boris, Bruno, Katia, Ronan, Roger, Rémi, Denis, David, Laura, Louis, Lucie, Julie, Théo, Teddy, Erwan, Emile, Andre, Alain, Alexa, Simon, Ms, Seb, Guy, Lã, Tom, Marc, Manu, Alex, Anne, Léa, Yoann, Joel, Elie, Elsa, Eric, Emma, Herv, Fred, Yann, Yvon, Marie, Manon, Jean, and Zelda