To change the name of the fonts.dir file, use the xserver-font-directory-file-name parameter to specify the new filename, then rename or copy the fonts.dir file to the desired name (Setup  ->  Change Setup Parameters  ->  Fonts  ->  Font Directory File Name).  
Table 7-8  xserver-font-directory-file-name Parameter
  Possible Values
  Result
default
 
fonts.dir 
 
filename
 
The X server uses the specified filename when attempting to locate the font directory management file.
 
 
To change the name of the fonts.alias file, use the xserver-font-alias-file-name parameter to specify the new filename, then rename or copy the fonts.alias file to the desired name (Setup  ->  Change Setup Parameters  ->  Fonts  ->  Font Alias File Name). 
Table 7-9  xserver-font-alias-file-name Parameter
  Possible Values
  Result
default
 
fonts.alias
 
filename
 
The X server uses the specified filename when attempting to locate the font alias management file.