Yes, "Book" is a common distinction for typeface weights made specifically for long form reading (most of the classic typefaces have this weight). However the eReading apps I've played with only bundle [up to] four specific weights together. They tend to prefer the following naming conventions:
FILE NAMES:
GreatFont-Regular.otf
GreatFont-Italic.otf
GreatFont-Bold.otf
GreatFont-BoldItalic.otf
INTERNAL WEIGHT NAMES:
Regular
Italic
Bold
Bold Italic
(the space is important)
INTERNAL TYPEFACE NAME:
Great Font
(note the lack of a weight here, like "Great Font Bold" which will cause bundling to fail)
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