Its actually pretty easy to do in Font Forge. But if installing FontForge is the issue there are other, smaller, programs to the same effect.
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TTX is command line and probably the easiest/smallest solution to renaming a font. There's a brief tutorial on exactly how to do that here: http://www.fontgeek.net/blog/?p=343
GlyphsApp (free trial version)
Fontographer (comparable to FontForge)