"librarian," 1610s, from Latin bibliothecarius, from bibliotheca (see bibliothek). An earlier form in English was bibliothecar (1580s).
Online Etymology Dictionary, © 2010 Douglas Harper
Examples from the Web for bibliothecary
In the latter he found the Lector colder than ever, the Bibliothecary warmer, the household more inflated.Titan: A Romance v. 1 (of 2)
Jean Paul Friedrich Richter
My ten minutes passed very rapidly in conversation with these two experts in books, the bibliopole and the bibliothecary.Our Hundred Days in Europe
Oliver Wendell Holmes