Cognomen Sonson (Sonson 
, سونسون , ลูกชาย 
) , in the entire world, is quite a rare last name. The last name Sonson is characteristic of Saint Lucia, where it is quite a common surname, Egypt, where it is quite a rare surname, and Tunisia. In absolute terms, it is commonest in Egypt, the Democratic Republic of the Congo, and the United States. Likewise, Sonson is the forename as well as the last name.