Marigold (Gamgee) Cotton was a Hobbit of the Shire.
History
Marigold was born on TA 2983 (SR 1383). She was the youngest child of Hamfast Gamgee ("The Gaffer") and Bell Goodchild. She was Samwise Gamgee's younger sister. Marigold had four other siblings: Hamson, Halfred, Daisy, and May.
She would later on marry Tolman Cotton, a good family friend who was three years her senior. She was also good friends with her husband's sister, Rosie, who would later go on to marry Sam.
Etymology
Like many female hobbits, Marigold was named after the homonymous flower.