Ethan Merritt - 2016-09-22

Gnuplot does not do it's own font handling. It passes through font names to whatever library or subsystem is relevant to the current terminal. Unfortunately that means fonts for a particular terminal may not be provided by another terminal, or may have a different name, or may require additional system configuration, etc.

Font handling for x11 has always been ridiculously convoluted, but in any case gnuplot has little control over it. Your best bet is to find an x11 font provided by your system that you like, and associating this with gnuplot at the system level by modifying the value of "gnuplot*font" in the system or private Xresources database.

Please see "help x11" and "help x11 x11_fonts".