Worldwide, Mercau (Mercau 
) is an extremely rare unknown gender forename. Much more frequently, Mercau is the last name as well as the forename.
Mr, Axel, Cora, Clau, Cruz, Cira, Raul, Rosa, Rene, Rina, Rita, Rito, Ruth, Dora, Lina, Lino, Luca, Luis, Luiz, Luly, Jose, Juan, Aida, Nano, Agus, Abel, Ms, Ale, Ali, Ana, Eli, Emi, Ema, Eva, Vir, Maru, Maxi, Mily, Mica, Mike, Sara, Sofi, Alan, Aldo, Anto, Anne, Arii, Adan, and Nair