The name of Danish origin and isar relationship between Danes and Denmark as a single kingdom is controversial.
The debate is first and foremost on whether the prefix "Dan" refers to the Danes or King Dan. The suffix "-mark" is to a lesser extent also debatable. The problem is enhanced because of the numerous references to Danes around Europe baths in ancient graske and Roman historians (as Gregory of Tours, Jordanes and Procopius) and in the Middle Ages (as Adam of Bremen, Beowulf, Widsith and Ages Edda)
Pa norront people were in the genitive majority called "danir" which can mean something like "flat rural residents." "Danes" is probably a derivative of the indoeuropaiske * dhen-, meaning "flat, flat brat".
"Mark" was on oldhojtysk and Anglo-Saxon used to mean "granseland". The word Denmark can thus at have meant "flatland residents granseland" and was possibly afgranset to forests in Schleswig, thus at the Danes granseland to the Germans to the south, and the suffix may also have connection to skovomrader as Finnmark or Telemark.
Populart it is said that the word "Denmark" first time navnes on the Jelling Stone around scar 985 Denmark (Denamearc) navnes however, already about 890 years of Norwegian Ottar in the Anglo-Saxon chronicle Orosius, and later by Alfred the Great, the ostfrankiske essay writing Regino of Prüm and Otto I.