One of the things I love about Guybrush's name is that it he was supposedly named accidentally.
From Wikipedia:
The origin of the name "Guybrush" comes in part from Deluxe Paint,
the tool used by the artists to create the character sprite. Since
the character had no name at this point, the file was simply called
'Guy'.
When the file was saved, Steve Purcell, the artist responsible
for the sprite, added 'brush' to the filename, indicating that it was
the Deluxe Paint "brush file" for the "Guy" sprite. The file name was
then "guybrush.bbm", so the developers eventually just started referring
to this unnamed 'Guy' as "Guybrush".