What are some nicknames for Jennifer?

Answer

The first that springs to mind is Jenny.

Jenny is often elongated to Jenny Wren in the UK

A Jenny wren is actually a small song bird, correct name is the Wren.

Jenny, Jen, Jensta, Jenna, Ifer, Jenno, Jenna, J, JenJennyJenJenJen, Jenjen, JenniJenno(thats what my friends call me lol)

and here is a cool way to spell Jennifer: Jenni4