An Etymological Dictionary of Astronomy and Astrophysics

A person, usually an official, who is in charge of the records, correspondence, minutes of meetings, and related affairs of an organization, company, association, etc. (Dictionary.com).

Etymology (EN): M.E. secretarie “one trusted with private or secret matters; confidant,” from M.L. secretarius “confidential officer, confidant, clerk, notary,”
from L. secretum “a secret, a hidden thing.”

Etymology (PE): Dabir, from Mid.Pers. dipîr, contraction of dipîvar (Mid.Pers. dip, dīp “document;” dīb “letter”); from O.Pers., from Proto-Ir. *dipī-uara- “he who preserves the documents;” cf. O.Pers. dipī- “inscription” + *Huar- “to cover;” cf. Av. vār- “to cover, hide, protect.”