Hello,
at that time (18th century), Etzhorn was part of the Oldenburg parish. The
church records of the parish of Oldenburg are deposited at
Niedersaechsisches Staatsarchiv Oldenburg
Damm 43
Oldenburg
email: (_poststelle@staatsarchiv-ol.niedersachsen.de_
(mailto:poststelle@staatsarchiv-ol.niedersachsen.de) )
good luck
Gerold Diers