I know a couple of girls called
Henrietta who go by
Jenny and I can't say I'm a fan. As a given name I find it infantile.
I like a lot of less common floral names but I don't care for Tulip at all - it sounds too much like 'chew lip' as most people say it and that is not attractive!
http://www.behindthename.com/pnl/167578