Cotman was the son of Cottar, and an ancestor of the Cottons of Bywater Hobbits. He married Rose Greenhand, the daughter of Holman the greenhanded, and their son (also called Holman) was the first Hobbit to use the family-name of Cotton.
Cotman was apparently not a wealthy Hobbit since his name means 'cottage dweller', meaning that he lived in a particularly small Hobbit-hole.
Cotman is a real-life surname.
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