This is the 6315th most frequent Catalan word.
mumford
"Mumford" is not a Catalan word.
Here, 'Mumford' is part of the name of the musical group 'Mumford & Sons', used as a proper noun.
El grup Mumford & Sons va fer un gran concert ahir a Barcelona.
The band Mumford & Sons gave a great concert yesterday in Barcelona.
In this sentence, 'mumfordiana' refers to concepts or theories developed by an individual named Mumford, used as an adjective.
He llegit un llibre interessant sobre la teoria mumfordiana en matemà tiques.
I have read an interesting book about Mumfordian theory in mathematics.
Here, 'Mumford' is used as a proper noun, referring to an individual named Mumford.