Beaufort-en-Vallée(France)
Editor of DKAR 1:58 identifies Monnet as in arrondisement of Beaugé/Baugé, which was abolished in 1926. Editor of cartulary of Saint-Aubin identifies Multonacus as Monnet in commune of Beaufort-en-Vallée (formerly in arrondisement of Beaugé).
Bonn(Germany)
referred to as 'villa Basilica' around the church of SS Cassius and Florentius in Bonn; geolocation for Bonn
Bouchemaine(France)
According to French Wikipedia, the modern commune consists of three villages: Pruniers, Bouchemaine et la Pointe. Editor of DKAR 1:58 identifies Pruniers with Prunarius.
Buchonia (wood)(Natural Landmark)
Wooded region around northern Rhön mountains in Hesse.