>>81357Jun can also be a girl's name.
From Wikipedia:
"Jun (じゅん, ジュン) is a Japanese given name used by either gender. "
For example, Kamigamo Jun from Natsu no Arashi (pic). To be fair, her thing in the show is that she is mistaken for a boy.
I don't think Junko is that common either.
Enoshima Junko from Danganronpa and Junko from Touhou come to mind, though.