Huffman has German, English, Scots-Irish/Northern Irish, Irish, Scottish, French, Dutch and Irish ancestry.
Felicity Huffman was born December 9, 1962, in Bedford, New York, the United States, into a wealthy Christian family of Grace Valle (née Ewing; 1921-2009) and Moore Peters Huffman (1910-1987), a banker and partner at Morgan Stanley. The youngest of eight children, with six sisters and one brother, she was raised by her mother after her parents divorced around the time of her first birthday.
She discovered that her biological father was a family friend Roger Tallman Maher when she was a teenager. She has seven siblings. They are 6 sisters Mariah, Betsy, Grace, Isabel, Jessie, and Jane, and one brother Moore Jr. In the 1970s her mother left New York and bought property in Snowmass, Colorado, where Felicity and her siblings spent their youth.
She told Oprah Winfrey that when she was born, her mother named her "Flicka", but had to change it because it was not a Christian name. She still uses "Flicka" as a nickname. The name "Flicka" comes from the book and movie My Friend Flicka (1943), a childhood favorite. It means "girl" in Swedish.