Last name Буа (Bua 
, Bois , Búa 
) , worldwide, is a common cognomen. The last name Буа is characteristic of Reunion, where it is quite a common surname, Grenada, and Saint Lucia (explore the name in all countries). Measured by absolute frequency, it is commonest in France, Indonesia, and Italy. Very seldom, Буа is the forename as well as the last name.