Presumably, this is him in 1871?
Reference RG10, Piece 4684, Folio 68, Page 37
Union Lane House, Sheffield
Eckhardt, Chas  Head  M  47  Labourer  b Nassau, Germany
Eckhardt, Christ.  Wife  F  44  Midwife  b Germany
Eckhardt, John  Son  M  24  Labourer  b Germany
Eckhardt, Jacob  Son  M  18  Pen and Pocket Knife  b Germany, Hess Daustadt
Eckhardt, Charles  Son  M  17  Edge Lock Maker (?)  b Germany
Eckhardt, Catherine  Daughter  F  10  Scholar  b Sheffield
Eckhardt, Elizabeth  Wife(??)   F  20  Domestic Servant   b Germany
Blyn, Adam  Widower  M  73  Labourer  b Germany