In all the world, Guillin (Guillin 
) is a very rare unisex given name. Much more frequently, Guillin is the last name as well as the forename.
Mr, Abel, Amed, Adri, Aida, Aura, Aude, Caro, Paul, Pipe, Raul, Rosa, Rene, Dora, Gaby, Lara, Leah, Lina, Lita, Luis, Luiz, Léa, Anne, Anna, Andy, Aldo, Ms, Max, Seb, Ana, Cã, Ben, Gã, Lea, Luz, Jã, Jany, Eva, Mara, Maye, Maud, Mely, Mily, Sara, Stã, Alex, Alix, Alan, Marc, and Jair