"Han er et barn."
Translation:He is a child.
Hun sounds like honey as in "Honey I'm home".
Han could be Hansel from Hansel and Gretel (as in Hansel is the male). Or if you're a star wars fan Han as in Han Solo! :D
I may be too late, but this might help you: https://www.duolingo.com/comment/4288076/Rules-about-en-and-et