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Family name Biwa (Biwa ) , worldwide, is a rare cognomen. The family name Biwa is characteristic of Namibia, where it is quite a common surname, Morocco, where it is a rare surname, and South Africa, where it is a very rare surname. In absolute terms, this name is the most popular in Namibia, India, and Indonesia. Likewise, Biwa is the forename as well as the last name.