Most surnames, including the Dieppa (variations of the surname Djepp-Djeep-Depp-Dieppe-Dieppo-Dieppa-Diepa-Yepa-Iepa) surname, came from patronymics (according to the baptismal, person's title, worldly name of one of the ancestors, including to the type of activity, place of origin, or some other characteristic of the ancestor). They started using their father's names these names came from many places including a dynasty's name and a person's occupation.
The Normans were a population arising in the medieval Duchy of Normandy from the intermingling between Norse Viking settlers and indigenous West Franks and Gallo-Romans. The term is also used to denote emigrants from the duchy who conquered other territories such as England and Sicily. The Norse settlements in West Francia (France) followed a series of raids on the French northern coast mainly from Denmark, although some also sailed from Norway and Sweden. Said settlements were finally legitimized when Rollo, a Scandinavian Viking leader, agreed to swear fealty to King Charles III of West Francia following the siege of Chartres in 911 AD. The intermingling in Normandy produced an ethnic and cultural "Norman" identity in the first half of the 10th century, an identity that continued to evolve over the centuries.
Dieppa is a Norman dynasty (Norse-Venetians-French) surname whom scholars point out to their modern origin in Normandy (Northman seafarer’s people) comprises mainland Normandy (a part of France) and the Channel Islands (mostly the British Crown Dependencies), the Northman seafarer’s people. One source points out the Norse seafarer’s people (Vikings warriors) from southern Scandinavia (in present-day Denmark, Norway, and Sweden). In different social strata, surnames appeared at different times. The history of the Dieppa (Djepp) family dates back several hundred years. and merchants began to spread in the country. At first, only the wealthiest – “eminent merchants” – had the honor of receiving the Dieppa surname. At this time, numerous Boyar's and Knjaz (both translated as "Prince") were Royal-Ancient Nobility, Titled, Hereditary, Personal, or Stateless equal title-holders granted and recognized by the Imperial court of Rus (Ancient nobility in Russia, equivalent aristocracy next in rank to a Prince), and Noble families began to call themselves. It was during this period of time that the names of noble families appeared. The Dieppa surname was inherited from generation to generation by male (or female) line.
It is known that they travel from France to abroad around the globe. Its inhabitants are a mixture of Vikings and Venetians who, settled and mix with the people of Normandy in this river mouth and with England in front, controlled and made expeditions reaching Brazil even before the Spanish and Portuguese. The (Djepp) ancestors founded the most distinguished port of Dieppe city. Dieppe, on the Alabaster Coast, in Pays de Caux, is a place that was appreciated by the Vikings because of its location by the Arques River and its deep harbor called "djeep". With the surname Dieppe and its derivations, there is a town in Germany called Dieppe and there were also Templar orders in relation to the surname. The sailors of Dieppe were known practically all over the world and were the first to arrive in Brazil I could also add that their ivory figures, medieval cartography, and glass are famous, since together with Murano, Venice they were highly appreciated by the Aristocracy who they were part. Another fact about the site (Dieppe) I will say is that it was the first Normandy landing invasion, in which the (nazi) Germans in World War II in 1944 massacred practically all the allies in the great majority of Canadians from there that in Canada there is also a town with that same toponym. Now there are many surnames similar to the one mentioned and some have the same origin but others do not; Dieppa in Germany is a last name of lineage, Dieppenbrock until now is unknown to me and Dieppenmbeck there is a Flemish painter with that last name and very good by the way in America, there are many people with this last name, some from Gran Canaria starting point for many emigrants traveling to the new world.