Jen is the heroine of the novel 'Teen Idol' by Meg Cabot. The book is a chick-lit roamnce sorta' thing. Perhaps her best book.

If it's "often used as an independent given name", how come there's no popularity data for it? It can't be all that common, can it? [noted -ed]

Jen Morgan is a heroine of Nancy Bond's novel 'A String in the Harp' (1976). The novel centers around a family of Welsh descent who must protect an Ancient Celtic artifact. The novel won the Newbery Honor.

Famous Bearer Jen Heil is an Canadian athlete who won silver in female moguls on Vancouver 2010.

In the movie "The Dark Crystal," one of the protagonists, a Gelfling, is called Jen, even though he is male.

Jen Estes, a popular fiction author.

Jen Scotts was the Pink Ranger from Power Rangers Time Force. She is so far the only Pink Ranger to serve as the leader of the team.

Jen sounds masculine to me. I wouldn't consider it feminine in my opinion!