Tradução - Árabe-Francês - ould

Arabic family names often feature 'ould". What does it mean? I know that "Ibn" means "son of" for instance

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Ould = le terme mauritanien pour "Ibn", "Ben", "Bin" (arabe classique)
Je me réponds à moi-même. En fait j'ai demandé à une amie sénégalaise...