O'neill Marriage Records: Groom Firstnames
- J. (2)
- James (104)
- James E (1)
- James G (1)
- James John (2)
- James Joseph (2)
- James Patrick (1)
- James T (1)
- Jamie (1)
- Jared (1)
- Javier (1)
- Jean-Philippe (2)
- Jeffrey (2)
- Jeremiah (3)
- Jerome (2)
- Jesus (1)
- Joathan (1)
- John (136)
- John A (1)
- John Christopher (1)
- John Francis (1)
- John Frederick (1)
- Joseph Edward (1)
- Joseph G (1)
- Joseph J (1)
- Joseph John (1)
- Joseph P (1)
- Joseph Thomas (1)
- Juan (7)
- Julio (2)
- Justin (5)