Koester

Koester is a surname of German origin. It is a variant of the name Köster, which itself is derived from the Middle High German word "koster" or "küster," meaning "sacristan" or "sexton." A sacristan is a person in charge of the sacristy, vestments, and other church-related items. The term could also refer to someone who lived near a church or monastery.

The surname Koester and its variants are found primarily in Germany and other countries with significant German diaspora populations, such as the United States. The name is believed to have originated as an occupational surname, identifying the individual's profession or association with the church.

Variations of the name include Köster, Koster, Coester, and Coster.