The traditional patron saints of librarians: Saint Jerome (was a translator, which sort of relates to books) Saint Catherine (associated with wisdom and learning), Saint Lawrence of Rome (was the keeper of the treasures of the church, so a sort of archivist). Saint Lawrence of Rome is the only one of traditional three I really like, was librarianlike in several ways: sold church treasures to serve the poor (budgeting for service), when asked to turn over the church’s wealth to the government, he presented the poor (patrons as the treasure of the library), when martyred on a gridiron, he let his tormentors know when he was done on one side, so they could turn him over (gallows humor).

Saints who were actually librarians or did librarian tasks:
Aldhelm of Sherborne: stood on the town’s bridge and told stories and sang songs to attract people, then added religious lessons at the end (like school visits and storytime), wrote clever and obscure verse (word nerd), “his reading was extensive–so extensive that he has been described as the first English librarian” (bibliophile)
Gregory II: Helped St Nothelm in the archives (researcher)
Bruno of Segni: was librarian of the Holy See
Notker Balbulus: Librarian of St. Gall’s Abbey, anthologist, “Notker’s emblem in art is a rod. He can be recognized as a Benedictine with a book in one hand and a broken rod in the other with which he strikes the devil.” (like managing library behavior?)
Cyril (monk): librarian at the church of Santa Sophia, invented an alphabet called glagolitic (word nerd), language geek and translator