"librarian," 1610s, from Latin bibliothecarius, from bibliotheca (see bibliothek). An earlier form in English was bibliothecar (1580s).
Examples from the Web for bibliothecary
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
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