Globally, Sillau (Sillau 
) is an extremely rare epicene first name. More prevalently, Sillau is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Sillau | Peru, United States, Tanzania, India, Brazil |
Ana, Sandra, Sheila, Stefan, Angela, Carlos, Carmen, Rafael, George, Jhonny, Tayane, Indira, Silvana, Alberto, Alfredo, Antonio, Carolyn, Katerin, Dorothy, Giovana, Giovnni, Vanessa, Miguel, Mirtha, Zaida, Holly, Susi, Anna, Bill, Raul, Rosa, Dana, Jose, Jean, Fran, Irma, Francis, Maria, Monte, Adela, Carla, Cesar, Bruno, Kevin, Paula, Luisa, Jaiza, Helen, Mario, and Meredith