Jacob
From the Hebrew, 'follower' or 'supplanter'.
James
From the Latin Iacomus.
Jason
The Greek form of Joshua.
Jasper
From the Persian, meaning the 'treasurer'.
Jed
A short form of Jedidiah, from the Hebrew 'beloved of God'.
Jeremy
From the Hebrew, meaning 'Jehovah's appointed'.
Jethro
From the Hebrew, meaning 'abundance'.
Jordan
From the Hebrew, meaning "going down'.