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Latin word librum comes from Proto-Indo-European *h₁lewdʰ-, Proto-Indo-European *dʰégʷʰe/o-, Romanian febris, Proto-Indo-European *leub(h), and later Latin febris (Fever.)
*h₁lewdʰ- (Proto-Indo-European)
*dʰégʷʰe/o- (Proto-Indo-European)
febris (Romanian)
*leub(h) (Proto-Indo-European)
*h₁lewdʰ-er-os (Proto-Indo-European)
febris (Latin)
Fever.
*louðeros (Proto-Italic)
(substantivised) child. Free.
loeber (Old Latin)
fior (Romanian)
Shudder, shiver. Thrill. Wince.
liber (Latin)
free, unrestricted.
libre (French)
Clear, free, vacant. Free, at liberty. Free, without obligation.