People : Johnnie Duff to Kenny Duff
Jon Duff 3 people
Jonathan Duff 2 people
Joni Duff 2 people
Jonna Duff 2 people
Joseph Duff 35 people
Josephine Duff 2 people
Joshua Duff 5 people
Joy Duff 6 people
Joyce Duff 5 people
Judith Duff 10 people
Judy Duff 3 people
Julia Duff 3 people
Julie Duff 25 people
June Duff 2 people
Justin Duff 10 people
Kaitlyn Duff 2 people
Karen Duff 22 people
Katelyn Duff 2 people
Katherine Duff 8 people
Kathleen Duff 10 people
Kathryn Duff 3 people
Kathy Duff 5 people
Katie Duff 2 people
Kay Duff 2 people
Keenan Duff 3 people
Keith Duff 8 people
Kelley Duff 3 people
Kellie Duff 2 people
Kelly Duff 15 people
Ken Duff 3 people
Kendra Duff 2 people
Kenneth Duff 19 people
Kenny Duff 2 people