question: What does it mean to have the letters OU added to the ending of a males last name ?
answer: some end in - ou , indicating the genitive case of this proper noun for patronymic reasons .
turker_answer: Having OU added to a males name indicates the genitive case of this proper noun for patronymic reasons .
rule-based: It means to have some end in - ou , indicating the genitive case of this proper noun for patronymic reasons the letters OU added to the ending of a males last name .