This is the name of one of the main adult female characters in Catherynne M. Valente's adult fantasy novel "Palimpsest" (2009). In the novel November remembers having read a book called "The Girl Who Circumnavigated Fairyland in a Ship of Her Own Making" when she was a child, and the heroine of that book was called September. Valente later wrote that book as a crowd-funded work. It became the first volume in her bestselling "Fairyland" series.
Its usage may be due to the popular saying 'danger is my middle name'.