Frances William Isaacs to Annie Isenegger - 1911 Census household returns
- Frances William Isaacs to George Isaacs
- George Isaacs to Golden Samuel Isaacs
- Gerald Isaacs to Henry Isaacs
- Henry Isaacs to Henry William Isaacs
- Henry William Isaacs to Isaac George Isaacs
- Isaac Judah Isaacs to James Isaacs
- James Isaacs to John Isaacs
- John Isaacs to Joseph Isaacs
- Joseph Isaacs to Judah Isaacs
- Julia Isaacs to Lewis Isaacs
- Lewis Isaacs to Mary Isaacs
- Mary Isaacs to Morris Isaacs
- Morris Isaacs to Pearlman Isaacs
- Peter Isaacs to Robert Isaacs
- Robert Daviss Isaacs to Samuel Isaacs
- Samuel Isaacs to Simon Isaacs
- Simon Isaacs to Thomas Isaacs
- Thomas Isaacs to William Isaacs
- William Isaacs to Alfred Isaacson
- Alice Isaacson to George Isaacson
- George Isaacson to Joseph Isaacson
- Julia Isaacson to Solomon Isaacson
- William Isaacson to Thomas Isabell
- William Isabell to Ingvalid Isaksen
- Jakob Isakson to Edward Isard
- Edward Isard to William Isard
- William Arthur Isard to Frederick George Isbell
- Frederick James Isbell to Sarah Ann Isbell
- Sarah Ann Isbell to Thomas Isbill
- Thomas Isbill to Emanuel Isbitzky
- P Isbitzsky to Adelaide Isdell
- Fitzgerald Isdell to Aaron Isenberg
- Abraham Isenberg to Annie Isenegger