»Glenda« comes from the Film »Glen or Glenda« by Ed Wood, who also directed »Plan 9 from outer space«.
The film is about, like you said, transsexuality.

Also note the logo of 9front, which is cirno, some anime character. For some reason, they decided glenda
was outdated-totally weird.

The 2f30 logo is pretty cool-it is also flat and abstract, but has some concrete meaning (division by zero: /0).
The suckless logos are really like modern art, dead simple, with a brutalistic style.

And there is also a new type of logo, which is used in lots of 'hipster' software: bright colors, abstract, although sometimes
with a little reference to the name (electron logo, atom text editor logo, slack logo).

I find it always interesting to judge a project simply by it's logo and then investigate it further and most of
the times to be happy I was right with my judgement.