If you install it on windows, the name is cootuecursessquare16x16, if you put the ttf in font folder, the name can be the file name without .ttf extension (this is the easiest way to do).
Anyway, cootuecursessquare16x16 always work.
If you install new font (in data, data/font, or your system font folder), just delete fontlist.txt in data folder so the game can scan it again. This is not a must if you only want to use file name in data/font folder.