FWIW: if the below can be believed, it appears the d'Aubervilles were based at/possessed Westenhanger since possibly 1066:
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"The ancient name (of Westenhanger) as it appears by the register of the monastery of St. Augustine was Le Hangre derived from the Saxon word "angra" meaning a wood. When the estate was later divided, the two parts were called Ostenhanger and Westenhanger until they became re-united under Sir Edward Poynings in 1509.
The property in the 12th century belonged to the Auberville family who were descended from Willam de Ogburville mentioned in the Doomsday Book, a knight who came over with William the Conqueror".
Through marriage Westenhanger Castle passed into the de Criol family and Sir John de Criol was allowed in 1343 to crenellate (embattle and make loop-holes) and two years later obtained a licence to found and endow a chantry in the Chapel of St. John in Westenhanger. [Ref: http://www.westenhangercastle.co.uk/Westenhanger_Castle_Histor.html]
Also FWIW: Osten & Westen are German for towards the East/West; Hang/Hänge means ridge/slope; Anger means a grass plot, a green, a common. Maybe just a coincidence, but Old Saxon & Old German do have the same roots.
Note: provided by curt_hofemann@yahoo.com