Last name Bilou (Bilou 
) , globally, is quite a common cognomen. The cognomen Bilou is habitual in Algeria, where it is quite a rare surname, the Democratic Republic of the Congo, and Morocco, where it is a rare surname. Measured by absolute frequency, this name is the most popular in Algeria, the Democratic Republic of the Congo, and France. Likewise, Bilou is the forename as well as the last name.