Origin of surname Kalkau?

earliest records can find 1600s , denmark, 100 years later germany , england..now not name english language , looking @ record parents names continent , not british.............

names words , words come languages, not countries, languages , people move around, countries stay put........so origin depend on researching tree find ancestors originated from, there no short cut ways of finding out surname...............

my great grandmother's surname kalkau, want know it's origin

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