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