"Denn is a surname of English origin, derived from the medieval personal name "Dennis", meaning "son of Dennis". It is believed to have been introduced to England by the Normans after the Conquest of 1066. The name has variations such as Denne and Den, and has been traced back to early records in the 13th century. Denn is a surname that may have been used to denote someone's parentage or familial ties, making it a common and enduring surname choice."

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