Here is what I found:
babyzone.com
[English] Variation of
Jenny which is a diminutive of
Jane and
Jennifer.
[Danish] **Lists as boys name** Danish form of
John[Dutch] **Lists as boys name** Dutch form of
John
20000names.com
JEN: Danish form of
John (God is gracious)
Babynames.com
Gender: Female
Meaning: White Wave
Origin: Welsh