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Grube translates as pit, (coal) mine, It is possible that this is a reference to the name of a particular pit. I have never heard of the word donatue, but there is the name Donatus, which is analogous to Nathan
George Grube was born in 1899.
George Grube died in 1982.
Rüdiger Grube was born in 1951.
Frank Grube was born in 1905.
Frank Grube died in 1945.
Christian Grube was born in 1934.
Charles Grube died in 1976-01.
Douglas I. Grube has written: 'Donors in disarray'
MLB player Jarrett Grube is 6'-04''.
MLB player Jarrett Grube was born in Corunna, IN.
Adolph Eduard Grube died in 1880.