If you have any more history to add please contact Brian Dowling
From the Surname data base (www.surnamedb.com/Surname/Munden) comes the following meaning of ‘Munden’
‘This name is of English origin from Great or Little Munden in Hertfordshire, recorded as Mundene in the Doomsday Book of 1086, the name derives from the Olde English pre 7th Century personal name Munda ( from “ Mund “, protection ), plus “ denu” , a valley,” Munda’s Valley”.’
There is a lot more on this name at the above link.
From other sources:
Great Munden or Munden Furnival was held by Gerard de Furnivall in 1200.
Brockholds Farm derives from ‘Badger holes’ v.brocc-hol. and was the home of Geoffrey de Brokhole and John de Brocholes in the 13th century.