Across the world, Marcillac (Marcillac 
) is an extremely rare unknown gender forename. Much more frequently, Marcillac is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Marcillac | Belgium, Switzerland, United States, Canada, France |
Mr, Andre, Anais, Aneta, Aurã, Chris, Carol, Barry, Bruno, Kevyn, Roger, Renee, Denis, David, Leila, Louis, Lucie, Lydia, Léon, Joris, Julie, Nelly, Alain, Aline, Serge, Sarah, Ms, Pia, Guy, Gã, Luc, Vã, Marc, Stã, Alix, Anne, Edith, Paul, Rene, Rita, Lola, Loic, Jean, Eric, Herv, Yves, Marie, Maguy, Robt, and Emily