- Jack
- Jacob, James
- Jad
- Jadon
- Jair, Yair
- Jamal
- Janis, Jānis
- Janosch
- Jared
- Jarl
- Jarne
- Jarogniew
- Jason
- Jasper
- Javier, Xavier
- Jawad
- Jean-Baptiste
- Jean-Christophe
- Jedidiah
- Jenő
- Jeppe
- Jeremiah, Jeremy
- Jericho
- Jerik
- Jereon
- Jibril
- Jindrich
- Joachim, Joaquin
- Joel
- Jolyon
- Jordan
- Joris
- Jorunas
- Jose
- Joseph
- Joshua
- Jovaras
- Judah, Jude
- Juho
- Jules
- Julian
- Julius
- Junius
- Juozas
- Jupp, Juppes
- Justin
- Justus