You can't change the names of bitmap or TrueType fonts in the System 7 Finder.
There are a few legitimate reasons why end users would want to rename their fonts, but allowing that freedom in the Finder would cause most users considerable confusion. Specifically, if a font name changes, you have to manually update all instances of that font in documents. For instance, if you changed "Palatino" to "MyFont," you would have to open any documents that used "Palatino," select the text, and choose "MyFont" from the font menu. Likewise, transferring files with renamed fonts between Macintosh computers would generate many problems. Therefore, System 7 does not allow changing font names in the Finder.
Utilities such as ResEdit and many font design applications can change the names of fonts.
Warning: The instructions in this article refer to using ResEdit. Apple Computer, Inc., is not liable for any damage done to your software through the use of ResEdit to alter software.